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SQL Tutorial - 25: The ORDER BY Clause
 
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The ORDER BY Clause is used to sort data obtained from a table through a SELECT Query. In this tutorial we'll check out simple applications of the ORDER BY Clause.
Views: 56530 The Bad Tutorials
Oracle Database 12c: Easy Top N and Pagination Queries
 
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Pagination queries using the row limiting clause to fetch N rows or a percentage of rows in a table. For more information, see [Limiting SQL Rows](http://www.oracle.com/pls/topic/lookup?ctx=db121&id=DWHSG9188), [row_limiting_clause](http://www.oracle.com/pls/topic/lookup?ctx=db121&id=SQLRF55636).
Views: 3423 OracleDBVision
Oracle DENSE_RANK Function
 
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https://www.databasestar.com/oracle-dense_rank/ The Oracle DENSE_RANK function allows you to calculate a rank of a row in a group of rows. It returns this rank as a NUMBER value. This function can be used as either an analytic or an aggregate function, and the syntax depends on how you use it. As an aggregate function it looks like this: DENSE_RANK ( expr, [expr(n)] ) WITHIN GROUP ( ORDER BY (order_expr [ASC|DESC] [NULLS FIRST|LAST] ) These parameters are: - expr: this is the value to search for in a particular table. You can specify multiple search values, and just separate them by a comma. - order_expr: this is used to order the expr values by, because you get a different results depending on what order you rank the values in. - NULLS FIRST or LAST: this is where you can specify if you want to have NULL values appear at the top of your ranking order or at the bottom. As an analytic function, it looks like this: DENSE_RANK() OVER ( [query_partition_clause] order_by_clause) The parameters are: - query_partition_clause: this is the expression that the ranking is “grouped” by, as analytic functions allow you to group data within rows. - order_by_clause: this is the expression to order your results by to determine a rank. For this function, if two records have the same sort or rank position, they will have the same RANK value. It won’t cause a gap in the rankings, unlike the RANK function which does cause a gap. For more information about the Oracle DENSE_RANK function, including all of the SQL shown in this video and the examples, read the related article here: https://www.databasestar.com/oracle-dense_rank/
Views: 310 Database Star
05 of 15 SQL Basics with Oracle - SELECT ... FROM ....
 
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This video shows the simplest, most commonly used SQL command: SELECT ... FROM. We use SQL Developer to view data from tables in the students-teams database and in the HR database. We see how to specify a schema name for a table and how to count rows in a table without showing detailed data from the table. (5 of 15) There is also an "Advanced SQL" series. (Search for "databasemec" for tutorials using SQL Server.)
Views: 3514 Jennifer Kreie
T-SQL - Sorting Data
 
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T-SQL - Sorting Data Watch more Videos at https://www.tutorialspoint.com/videotutorials/index.htm Lecture By: Mr. Anadi Sharma, Tutorials Point India Private Limited
jQuery datatables stored procedure for paging sorting and searching
 
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Link for all dot net and sql server video tutorial playlists https://www.youtube.com/user/kudvenkat/playlists?sort=dd&view=1 Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2015/08/jquery-datatables-stored-procedure-for.html In this video we will discuss implementing a stored procedure that can perform paging sorting and searching. In our upcoming videos we will discuss writing a generic handler that calls this stored procedure. The generic handler will convert the data to JSON format. The JSON formatted data can then be consumed by the jQuery datatables plugin. All the processing, that is, paging, sorting and searching is done on the server side. If the dataset is small you can retrieve all the data at once and all the processing (i.e paging, searching, sorting) can be done on the client-side. We discussed this in Part 106 for jQuery tutorial. However, if the dataset is large (i.e if you have millions of records), loading all data at once is not the best thing to do from a performance standpoint. With large dataset, we only want to load the correct set of rows (sorted, paged and filtered data ) that want to display on the page. So all the processing ((i.e paging, searching and sorting) should be done by the server. So in this and our upcoming videos we will discuss performing server side processing. SQL Script to create the table and populate it with test data Create table tblEmployees ( ID int primary key identity, FirstName nvarchar(50), LastName nvarchar(50), Gender nvarchar(20), JobTitle nvarchar(20) ) Go Insert into tblEmployees values('Mark', 'Hastings','Male','Developer') Insert into tblEmployees values('Maria', 'Nicholas','Female','Developer') Insert into tblEmployees values('Robert', 'Stephenson','Male','Sr. Developer') Insert into tblEmployees values('Mary', 'Quant','Female','Sr. Developer') Insert into tblEmployees values('John', 'Stenson','Male','Sr. Developer') Insert into tblEmployees values('Gilbert', 'Sullivan','Male','Developer') Insert into tblEmployees values('Rob', 'Gerald','Male','Sr. Developer') Insert into tblEmployees values('Ron', 'Simpson','Male','Developer') Insert into tblEmployees values('Sara', 'Solomon','Female','Sr. Developer') Insert into tblEmployees values('Rad', 'Wicht','Male','Sr. Developer') Insert into tblEmployees values('Julian', 'John','Male','Developer') Insert into tblEmployees values('James', 'Bynes','Male','Sr. Developer') Insert into tblEmployees values('Mary', 'Ward','Female','Developer') Insert into tblEmployees values('Michael', 'Niron','Male','Sr. Developer') SQL Server stored procedure paging sorting and searching create proc spGetEmployees @DisplayLength int, @DisplayStart int, @SortCol int, @SortDir nvarchar(10), @Search nvarchar(255) = NULL as begin Declare @FirstRec int, @LastRec int Set @FirstRec = @DisplayStart; Set @LastRec = @DisplayStart + @DisplayLength; With CTE_Employees as ( Select ROW_NUMBER() over (order by case when (@SortCol = 0 and @SortDir='asc') then Id end asc, case when (@SortCol = 0 and @SortDir='desc') then Id end desc, case when (@SortCol = 1 and @SortDir='asc') then FirstName end asc, case when (@SortCol = 1 and @SortDir='desc') then FirstName end desc, case when (@SortCol = 2 and @SortDir='asc') then LastName end asc, case when (@SortCol = 2 and @SortDir='desc') then LastName end desc, case when (@SortCol = 3 and @SortDir='asc') then Gender end asc, case when (@SortCol = 3 and @SortDir='desc') then Gender end desc, case when (@SortCol = 4 and @SortDir='asc') then JobTitle end asc, case when (@SortCol = 4 and @SortDir='desc') then JobTitle end desc ) as RowNum, COUNT(*) over() as TotalCount, Id, FirstName, LastName, Gender, JobTitle from tblEmployees where (@Search IS NULL Or Id like '%' + @Search + '%' Or FirstName like '%' + @Search + '%' Or LastName like '%' + @Search + '%' Or Gender like '%' + @Search + '%' Or JobTitle like '%' + @Search + '%') ) Select * from CTE_Employees where RowNum ] @FirstRec and RowNum [= @LastRec end Finally test the stored procedure
Views: 39426 kudvenkat
Part 4   Delete duplicate rows in sql
 
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Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2014/05/part-4-delete-duplicate-rows-in-sql.html In this video, we will discuss deleting all duplicate rows except one from a sql server table. SQL Script to create Employees table Create table Employees ( ID int, FirstName nvarchar(50), LastName nvarchar(50), Gender nvarchar(50), Salary int ) GO Insert into Employees values (1, 'Mark', 'Hastings', 'Male', 60000) Insert into Employees values (1, 'Mark', 'Hastings', 'Male', 60000) Insert into Employees values (1, 'Mark', 'Hastings', 'Male', 60000) Insert into Employees values (2, 'Mary', 'Lambeth', 'Female', 30000) Insert into Employees values (2, 'Mary', 'Lambeth', 'Female', 30000) Insert into Employees values (3, 'Ben', 'Hoskins', 'Male', 70000) Insert into Employees values (3, 'Ben', 'Hoskins', 'Male', 70000) Insert into Employees values (3, 'Ben', 'Hoskins', 'Male', 70000) The delete query should delete all duplicate rows except one. Here is the SQL query that does the job. PARTITION BY divides the query result set into partitions. WITH EmployeesCTE AS ( SELECT *, ROW_NUMBER()OVER(PARTITION BY ID ORDER BY ID) AS RowNumber FROM Employees ) DELETE FROM EmployeesCTE WHERE RowNumber ] 1
Views: 329062 kudvenkat
13 of 15 SQL Basics with Oracle - GROUP BY and HAVING in SQL
 
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This video explains the HAVING clause that is used to filter data based on criteria for aggregate values. There is also an example of filtering data in the WHERE clause along with a filtering data in in the HAVING clause. (13 of 15) There is also an "Advanced SQL" series. (Search for "databasemec" for tutorials using SQL Server.)
Views: 3670 Jennifer Kreie
Learn Oracle | How to use the Merge Statement in SQL
 
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Pebbles present, Learn Oracle 10g with Step By Step Video Tutorials. Learn Oracle 10g Tutorial series contains the following videos : Learn Oracle - History of Oracle Learn Oracle - What is Oracle - Why do we need Oracle Learn Oracle - What is a Database Learn Oracle - What is Grid Computing Learn Oracle - What is Normalization Learn Oracle - What is ORDBMS Learn Oracle - What is RDBMS Learn Oracle - Alias Names, Concatenation, Distinct Keyword Learn Oracle - Controlling and Managing User Access (Data Control Language) Learn Oracle - Introduction to SQL Learn Oracle - Oracle 10g New Data Types Learn Oracle - How to Alter a Table using SQL Learn Oracle - How to Create a Package in PL SQL Learn Oracle - How to Create a Report in SQL Plus Learn Oracle - How to Create a Table using SQL - Not Null, Unique Key, Primary Key Learn Oracle - How to Create a Table using SQL Learn Oracle - How to Create a Trigger in PL SQL Learn Oracle - How to Delete Data from a Table using SQL Learn Oracle - How to Drop and Truncate a Table using SQL Learn Oracle - How to Insert Data in a Table using SQL Learn Oracle - How to open ISQL Plus for the first time Learn Oracle - How to Open SQL Plus for the First Time Learn Oracle - How to Update a Table using SQL Learn Oracle - How to use Aggregate Functions in SQL Learn Oracle - How to use Functions in PL SQL Learn Oracle - How to use Group By, Having Clause in SQL Learn Oracle - How to Use Joins, Cross Join, Cartesian Product in SQL Learn Oracle - How to use Outer Joins (Left, Right, Full) in SQL Learn Oracle - How to use the Character Functions, Date Functions in SQL Learn Oracle - How to use the Merge Statement in SQL Learn Oracle - How to use the ORDER BY Clause with the Select Statement Learn Oracle - How to use the SELECT Statement Learn Oracle - How to use the Transactional Control Statements in SQL Learn Oracle - How to use PL SQL Learn Oracle - Data Types in PL SQL Learn Oracle - Exception Handling in PL SQL Learn Oracle - PL SQL Conditional Logics Learn Oracle - PL SQL Cursor Types - Explicit Cursor, Implicit Cursor Learn Oracle - PL SQL Loops Learn Oracle - Procedure Creation in PL SQL Learn Oracle - Select Statement with WHERE Cause Learn Oracle - SQL Operators and their Precedence Learn Oracle - Using Case Function, Decode Function in SQL Learn Oracle - Using Logical Operators in the WHERE Clause of the Select Statement Learn Oracle - Using Rollup Function, Cube Function Learn Oracle - Using Set Operators in SQL Learn Oracle - What are the Different SQL Data Types Learn Oracle - What are the different types of Databases Visit Pebbles Official Website - http://www.pebbles.in Subscribe to our Channel – https://www.youtube.com/channel/UCNNjWVsQqaMYccY044vtHJw?sub_confirmation=1 Engage with us on Facebook at https://www.facebook.com/PebblesChennai Please Like, Share, Comment & Subscribe
Views: 1731 Pebbles Tutorials
SQL with Oracle 10g XE - Using the DISTINCT Function
 
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In this video I use the DISTINCT function to list the values of a column from a query and remove the duplicate listings. When using the DISTINCT function be sure to have parenthesis around the column you wish to perform the function on. You can't use the * to list all the columns in the SELECT command, so you will need to write the columns you wish to see out. If you want to rename the column you created with the function use the keyword AS on the SELECT line. This video is part of a series of videos with the purpose of learning the SQL language. For more information visit Lecture Snippets at http://lecturesnippets.com.
Views: 3600 Lecture Snippets
03 of 15 SQL Basics with Oracle - Creating tables
 
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This video in the "SQL Fundamentals" series explains how to run scripts to create a database. Oracle software is used. Scripts are available for these SQL commands and the video shows where to get the scripts (3 of 15). There is also an "Advanced SQL" series. (Search for "databasemec" for tutorials using SQL Server.)
Views: 5218 Jennifer Kreie
Order By & Top-N: Databases for Developers #12
 
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To guarantee your queries return rows in a particular sequence, you must use an order by! This episode shows you how to do this and limit your results to the first N rows in an ordered set. Want to know more? Take the course: https://devgym.oracle.com/pls/apex/dg/class/databases-for-developers-next-level.html Order by clause documentation: https://docs.oracle.com/en/database/oracle/oracle-database/18/sqlrf/SELECT.html#GUID-CFA006CA-6FF1-4972-821E-6996142A51C6 Need help with SQL? Ask us over on AskTOM: https://asktom.oracle.com Twitter: https://twitter.com/ChrisRSaxon Daily SQL Twitter tips: https://twitter.com/SQLDaily All Things SQL blog: https://blogs.oracle.com/sql/ Videos produced by Philip Lima productions. ============================ The Magic of SQL with Chris Saxon Copyright © 2015 Oracle and/or its affiliates. Oracle is a registered trademark of Oracle and/or its affiliates. All rights reserved. Other names may be registered trademarks of their respective owners. Oracle disclaims any warranties or representations as to the accuracy or completeness of this recording, demonstration, and/or written materials (the “Materials”). The Materials are provided “as is” without any warranty of any kind, either express or implied, including without limitation warranties or merchantability, fitness for a particular purpose, and non-infringement.
Views: 1059 The Magic of SQL
5 of 6  SQL Advanced with Oracle - A query with nested aggregate functions
 
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This video gives an example of nested aggregate functions. A subquery with aggregate functions is placed in the WHERE clause of the outer query, which also contains aggregate functions. (5 of 6) There is also an "SQL Fundamentals" series. (Search for "databasemec" for tutorials using SQL Server.)
Views: 9136 Jennifer Kreie
Sql server query plan cache
 
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Text version of the video http://csharp-video-tutorials.blogspot.com/2017/04/sql-server-query-plan-cache.html Slides http://csharp-video-tutorials.blogspot.com/2017/04/sql-server-query-plan-cache_12.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All SQL Server Tutorial Videos https://www.youtube.com/playlist?list=PL08903FB7ACA1C2FB All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists In this video we will discuss 1. What happens when a query is issued to SQL Server 2. How to check what is in SQL Server plan cache 3. Things to consider to promote query plan reusability What happens when a query is issued to SQL Server In SQl Server, every query requires a query plan before it is executed. When you run a query the first time, the query gets compiled and a query plan is generated. This query plan is then saved in sql server query plan cache. Next time when we run the same query, the cached query plan is reused. This means sql server does not have to create the plan again for that same query. So reusing a query plan can increase the performance. How long the query plan stays in the plan cache depends on how often the plan is reused besides other factors. The more often the plan is reused the longer it stays in the plan cache. How to check what is in SQL Server plan cache SELECT cp.usecounts, cp.cacheobjtype, cp.objtype, st.text, qp.query_plan FROM sys.dm_exec_cached_plans AS cp CROSS APPLY sys.dm_exec_sql_text(plan_handle) AS st CROSS APPLY sys.dm_exec_query_plan(plan_handle) AS qp ORDER BY cp.usecounts DESC As you can see we have sorted the result set by usecounts column in descending order, so we can see the most frequently reused query plans on the top. usecounts - Number of times the plan is reused objtype - Specifies the type of object text - Text of the SQL query query_plan - Query execution plan in XML format To remove all elements from the plan cache use the following command DBCC FREEPROCCACHE In older versions of SQL Server up to SQL Server 6.5 only stored procedure plans are cached. The query plans for Adhoc sql statements or dynamic sql statements are not cached, so they get compiled every time. With SQL Server 7, and later versions the query plans for Adhoc sql statements and dynamic sql statements are also cached. Things to consider to promote query plan reusability For example, when we execute the following query the first time. The query is compiled, a plan is created and put in the cache. Select * From Employees Where FirstName = 'Mark' When we execute the same query again, it looks up the plan cache, and if a plan is available, it reuses the existing plan instead of creating the plan again which can improve the performance of the query. However, one important thing to keep in mind is that, the cache lookup is by a hash value computed from the query text. If the query text changes even slightly, sql server will not be able to reuse the existing plan. For example, even if you include an extra space somewhere in the query or you change the case, the query text hash will not match, and sql server will not be able find the plan in cache and ends up compiling the query again and creating a new plan. Another example : If you want the same query to find an employee whose FirstName is Steve instead of Mark. You would issue the following query Select * From Employees Where FirstName = 'Steve' Even in this case, since the query text has changed the hash will not match, and sql server will not be able find the plan in cache and ends up compiling the query again and creating a new plan. This is why, it is very important to use parameterised queries for sql server to be able to reuse cached query plans. With parameterised queries, sql server will not treat parameter values as part of the query text. So when you change the parameters values, sql server can still reuse the cached query plan. The following query uses parameters. So even if you change parameter values, the same query plan is reused. Declare @FirstName nvarchar(50) Set @FirstName = 'Steve' Execute sp_executesql N'Select * from Employees where [email protected]', N'@FN nvarchar(50)', @FirstName One important thing to keep in mind is that, when you have dynamic sql in a stored procedure, the query plan for the stored procedure does not include the dynamic SQL. The block of dynamic SQL has a query plan of its own. Summary: Never ever concatenate user input values with strings to build dynamic sql statements. Always use parameterised queries which not only promotes cached query plans reuse but also prevent sql injection attacks.
Views: 24045 kudvenkat
SQL - Rownum in mysql || Add counter or row number column
 
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SELECT @add_row:[email protected]_row+1 AS row_number, first_name FROM customers, (SELECT @add_row:=100)A
Views: 168 Data Disc
Oracle High Water Mark
 
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A Brief video about Oracle's Table High Water Mark and How to resolve issues associated with it Music: https://www.bensound.com
Views: 245 ORA-600
How To Get Top or Bottom Rows In SQL
 
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Learn how to display the top or bottom rows from a SELECT statement result. As an added bonus, learn how to use CTEs (Common Table Expressions) to sort your result in a different manner.
Views: 478 Kris Wenzel
NTILE function in SQL Server
 
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In this video we will discuss NTILE function in SQL Server NTILE function 1. Introduced in SQL Server 2005 2. ORDER BY Clause is required 3. PARTITION BY clause is optional 4. Distributes the rows into a specified number of groups 5. If the number of rows is not divisible by number of groups, you may have groups of two different sizes. 6. Larger groups come before smaller groups For example NTILE(2) of 10 rows divides the rows in 2 Groups (5 in each group) NTILE(3) of 10 rows divides the rows in 3 Groups (4 in first group, 3 in 2nd & 3rd group) Syntax : NTILE (Number_of_Groups) OVER (ORDER BY Col1, Col2, ...) SQL Script to create Employees table Create Table Employees ( Id int primary key, Name nvarchar(50), Gender nvarchar(10), Salary int ) Go Insert Into Employees Values (1, 'Mark', 'Male', 5000) Insert Into Employees Values (2, 'John', 'Male', 4500) Insert Into Employees Values (3, 'Pam', 'Female', 5500) Insert Into Employees Values (4, 'Sara', 'Female', 4000) Insert Into Employees Values (5, 'Todd', 'Male', 3500) Insert Into Employees Values (6, 'Mary', 'Female', 5000) Insert Into Employees Values (7, 'Ben', 'Male', 6500) Insert Into Employees Values (8, 'Jodi', 'Female', 7000) Insert Into Employees Values (9, 'Tom', 'Male', 5500) Insert Into Employees Values (10, 'Ron', 'Male', 5000) Go NTILE function without PARTITION BY clause : Divides the 10 rows into 3 groups. 4 rows in first group, 3 rows in the 2nd & 3rd group. SELECT Name, Gender, Salary, NTILE(3) OVER (ORDER BY Salary) AS [Ntile] FROM Employees What if the specified number of groups is GREATER THAN the number of rows NTILE function will try to create as many groups as possible with one row in each group. With 10 rows in the table, NTILE(11) will create 10 groups with 1 row in each group. SELECT Name, Gender, Salary, NTILE(11) OVER (ORDER BY Salary) AS [Ntile] FROM Employees NTILE function with PARTITION BY clause : When the data is partitioned, NTILE function creates the specified number of groups with in each partition. The following query partitions the data into 2 partitions (Male & Female). NTILE(3) creates 3 groups in each of the partitions. SELECT Name, Gender, Salary, NTILE(3) OVER (PARTITION BY GENDER ORDER BY Salary) AS [Ntile] FROM Employees Link for all dot net and sql server video tutorial playlists https://www.youtube.com/user/kudvenkat/playlists?sort=dd&view=1 Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2015/10/ntile-function-in-sql-server.html
Views: 37547 kudvenkat
SQL Table Row Count
 
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This tutorial video will walk you through how to count how many rows there are in every table in a database. You can also sort by schema. It is all done by looking at the sys tables. Github Script: https://github.com/ProfessorPitch/ProfessorPitch/blob/master/SQL/Table%20Rowcount.sql
Views: 54 ProfessorPitch
SQL: Backup & Recovery Part-1
 
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In this tutorial, you'll learn how to take backup and restore the same when the tables/schema are dropped...
Views: 5034 radhikaravikumar
Order By in SQL| Part 8 | SQL tutorial for beginners | Tech Talk Tricks
 
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Welcome to tech talk tricks and in this video, we will learn about SQL order by the query in SQL. So stay tuned and watch how we to use order by query in SQL. #TechTalkTricks #RanaSingh The ORDER BY keyword is used to sort the result-set in ascending or descending order. The ORDER BY keyword sorts the records in ascending order by default. To sort the records in descending order, use the DESC keyword. SELECT column1, column2, ... FROM table_name ORDER BY column1, column2, ... ASC|DESC; sql order by group by sql order by number sql order by multiple columns sql order by date order by desc mysql sql order by alphabetical describe table in sql order by oracle At tech talk trick channel you will learn all kind of technology like language,tutorials and amazing computer tips and tricks. ************************************************** Follow Tech Talk Trick on Facebook https://www.facebook.com/techtalktricks ************************************************** Follow tech talk trick on Twitter https://twitter.com/tecktalktrick ************************************************** Follow Tech Talk Tricks on Instagram https://www.instagram.com/techtalktricks ************************************************** Subscribe tech talk tricks on YouTube https://www.youtube.com/techtalktricks ***************************************************
Views: 736 Tech Talk Tricks
Oracle SQL Column Alias
 
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Views: 55 Kalyan S
What is a PARTITION in Oracle? Why to use Partition And Types of Partitions
 
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Hi guys in my today scenario I'm going to explain with you What is a PARTITION in Oracle? #WhatisPARTITION Why to use Partition And Types of Partitions Oracle database Unbeatable,Unbreakable Platform..
Views: 22617 Oracle World
Rewriting SQL queries for Performance in 9 minutes
 
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ENGLISH CAPTIONS AVAILABLE - SPANISH SUBTITLES - Full transcript (with some screenshots) available for a small fee at http://stores.lulu.com/konagora/. A brief example about how you can improve query performance by analyzing and rewriting queries.
Views: 72199 roughsealtd
Part 5   SQL query to find employees hired in last n months
 
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Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2014/05/part-5-sql-query-to-find-employees.html This question is asked is many sql server interviews. If you have used DATEDIFF() sql server function then you already know the answer. -- Replace N with number of months Select * FROM Employees Where DATEDIFF(MONTH, HireDate, GETDATE()) Between 1 and N
Views: 169297 kudvenkat
oracle interview question reverse key index
 
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Description: Oracle Interview Question - oracle index related questions 1. What is Index? How to create index? 2. What are the types of index? 3. How to find the list of indexes for a given table? 4. Explain B-tree index 5. Explain Bitmap index 6. Explain "Function based" index 7. Explain "Reverse Key" index 8. When to choose what type of index? 9. How to know index is being used? 10. How to monitor index usage? 11. What are the advantages/drawbacks of indexes? Click here to subscribe to my youtube channel http://www.youtube.com/channel/UCBt6VrxAIb5jLh9HLDcdwtQ?sub_confirmation=1 Oracle Interview questions and Answers at https://www.youtube.com/playlist?list=PLb1qVSx1k1Vr0v4wVyvT3GEuA0J0M4xBm Oracle 18C New features at https://www.youtube.com/playlist?list=PLb1qVSx1k1Vqe06V1tIBcvnslMPWX69bW Oracle 12C New features at https://www.youtube.com/playlist?list=PLb1qVSx1k1VqM1u2IHWzZIgziqejl6wx- Oracle PLSQL records and collections at https://www.youtube.com/playlist?list=PLb1qVSx1k1VpAFTXopXvAh_D3PLcTntdm
Views: 134 Siva Academy
Hash Partition in Oracle
 
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This course has been designed to impart the in-depth knowledge about the partitioning types and architecture in the Oracle RDBMS. For more information on this course, please visit https://www.koenig-solutions.com/oracle-database-12-c-implement-partitioning-training.aspx
Views: 75 Koenig Solutions
11 MySQL Tutorial for Beginners: The LIMIT Clause
 
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The LIMIT clause limits the number of rows in the result set. In its simplest form, you code the LIMIT clause with a single numeric argument. If you code a single argument, it specifies the maximum row count, beginning with the first row. If you code two arguments in a LIMIT clause, the first one represents the starting point for the result set, also called the "offset". This "offset" starts to count from a value of zero. This means that zero refers to the first row in the result set, one to the second, two to the third and so on. SELECT, FROM, WHERE, ORDER BY, and LIMIT are the five main clauses of the SELECT statement but only the SELECT clause is required. When you code the SELECT clause, you should include only the columns you really need (for example, you shouldn't code an asterisk to retrieve all the columns unless you need all the columns). That's because the amount of data that's retrieved can affect system performance. That goes for retrieving rows too. The fewer rows you retrieve, the more efficient the statement will be. Because of that, you typically include a WHERE clause on your SELECT statements with a search condition that filters the rows in the base table so only the rows you need are retrieved EXERCISES for your SELF-TRAINING: http://golearnfast.com/Quizzes.php?_SelectSmallerGroup_288=0&Lessons_ID=288 SCRIPT FOR THE EXAMPLES: http://www.golearnfast.com/files/lessons_material/lesson_277_1440544998.sql SUBSCRIBE! https://www.youtube.com/channel/UCMEaGDoHU7c9tWyafZ9vC6Q?sub_confirmation=1 FACEBOOK https://www.facebook.com/golearnfast GOOGLE+ https://plus.google.com/u/0/b/101326338689489366802/
Views: 3483 golearnfast
Null value in oracle
 
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this video describes null concept in oracle. join the group and share your knowledge and ask your doubts. https://www.facebook.com/groups/940425699338535/
SQL with Oracle 10g XE - Using ALTER TABLE to Modify Table Columns
 
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In this video I use the ALTER TABLE command to modify an existing field column. The command will allow you to change the data types, whether the field can be null, or even the primary key. When using the ALTER TABLE command you would use the keyword MODIFY to make changes to an existing column. Be careful when changing a data type of the null field as existing data may cause an error if not in compliance with the new change. The code I used to alter the Books table is : ALTER TABLE BOOKS MODIFY ISBN_10 VARCHAR(13); This video is part of a series of videos with the purpose of learning the SQL language. For more information visit Lecture Snippets at http://lecturesnippets.com.
Views: 15712 Lecture Snippets
PERCENTILE_CONT, PERCENTILE_DISC in SQL Server
 
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Click here to Subscribe to IT PORT Channel : https://www.youtube.com/channel/UCMjmoppveJ3mwspLKXYbVlg PERCENTILE_CONT - Calculates a percentile based on a continuous distribution of the column value in SQL Server. The result is interpolated and might not be equal to any of the specific values in the column PERCENTILE_DISC - Computes a specific percentile for sorted values in an entire rowset or within distinct partitions of a rowset in SQL Server. It calculates the percentile based on a discrete distribution of the column values; the result is equal to a specific value in the column. These two analytic functions explained in this Video.
Views: 1709 IT Port
MySQL tutorial 4 - Limit, Offset and Ordering
 
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This tutorial will show you how to limit your results, create offsets and change the order of the results you receive. Sponsored by DevMountain. Get yourself career ready, check out their website: http://goo.gl/enNbQV Don't forget to tell them I sent you. Follow me on social media: Twitter: https://twitter.com/QuentinWatt Facebook: https://www.facebook.com/quentinwatt Instagram: https://www.instagram.com/quentinwatt Snapchat: https://www.snapchat.com/add/quentinwatt92 Become a Patron: https://www.patreon.com/QuentinWatt Subscribe to my Vlog channel: https://www.youtube.com/c/Quentin Subscribe to this channel: https://www.youtube.com/QuentinWatt Please note: I do not offer web development services, private tutoring, or "assistance" on school or university projects. I am not an online support service, and I'm not interested in setting up a "start up" business with viewers.
Views: 20517 Quentin Watt Tutorials
Part 6   Transform rows into columns in sql server
 
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Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2014/06/part-6-transform-rows-into-columns-in.html This is another common sql server interview question. We will be using Countries table in this example. SQL to create the table Create Table Countries ( Country nvarchar(50), City nvarchar(50) ) GO Insert into Countries values ('USA','New York') Insert into Countries values ('USA','Houston') Insert into Countries values ('USA','Dallas') Insert into Countries values ('India','Hyderabad') Insert into Countries values ('India','Bangalore') Insert into Countries values ('India','New Delhi') Insert into Countries values ('UK','London') Insert into Countries values ('UK','Birmingham') Insert into Countries values ('UK','Manchester') Here is the interview question. Write a sql query to transpose rows to columns. Using PIVOT operator we can very easily transform rows to columns. Select Country, City1, City2, City3 From ( Select Country, City, 'City'+ cast(row_number() over(partition by Country order by Country) as varchar(10)) ColumnSequence from Countries ) Temp pivot ( max(City) for ColumnSequence in (City1, City2, City3) ) Piv
Views: 188435 kudvenkat
SQL ORDER BY Keyword
 
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The SQL ORDER BY keyword is used to sort the query results in ascending or descending order based on the columns(one or more) that you specify to order by.
Views: 120 suresh babu
Oracle Database tutorials 3:How to enable Line numbers in SQl Developer.
 
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Wishlist: http://bit.ly/wishlist-amazon In this tutorial for database 11g You will see how to enable Line numbers in SQL Developer. This SQL tutorial and Oracle database 11g tutorial for beginners will show how to enable Line numbers in SQL Developer. Tool used in this tutorial is SQL developer. This tutorial series is part of SQL expert exam certification training. if you are preparing for SQL certification you can use my tutorials. This SQL Tutorial is a part of free training. Copy Cloud referral link || Use this link to join copy cloud and get 20GB of free storage https://copy.com?r=j7eYO7 Contacts Email [email protected] Twitter https://twitter.com/rebellionrider Instagram http://instagram.com/RebellionRider Facebook. https://www.facebook.com/imthebhardwaj Linkedin. in.linkedin.com/in/mannbhardwaj/ Thanks for linking, commenting, sharing and watching more of our videos
Views: 248398 Manish Sharma
SQL ORDER BY Clause In Telugu -  ORDER BY clause in SQL-vlr training
 
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For all sql videos in Telugu :http://www.vlrtraining.in/sql-training-videos-telugu/ In Telugu: SQL ORDER BY Clause In Telugu Sorting in SQL Using Order By Clause SQL ORDER BY Clause In English: download sql study material Website: http://www.vlrtrain.in/2016/09/download-sql-files.html Learn SQL sql tutorial for beginners sql commands oracle sql tutorial sql tutorial advanced mysql tutorial sql tutorial video SQL Tutorial Tutorials SQL The SQL ORDER BY clause is used to sort the data in ascending or descending order, based on one or more columns. Some databases sort the query results in an ascending order by default.
Views: 1948 VLR Training
DENSE_RANK Analytic Function in SQL with an Example
 
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DENSE_RANK() Analytic Function: DENSE_RANK calculates the rank of a value in a group of values. The return type is NUMBER. If two or more rows tie for a rank, each tied rows receives the same rank. For example, if the two top employees have the same salary value, they are both ranked one. The employee with the next highest salary is ranked number two. This is one more than the number of distinct rows that come before this row. Therefore, the numbers returned by the DENSE_RANK function do not have gaps and always have consecutive ranks. The sort order that is used for the whole query determines the order in which the rows appear in a result set.This implies that a row ranked number one does not have to be the first row in the partition. PARTITION BY clause: Divides the query result set into partitions. The window function is applied to each partition separately and computation restarts for each partition. ORDER BY clause: Defines the logical order of the rows within each partition of the result set. That is, it specifies the logical order in which the window functioncalculation is performed. Query used in Video: select ename,deptno,sal,DENSE_RANK() OVER (PARTITION BY deptno ORDER BY SAL) from emp; Video Explanation: Here 6th row assigned with Rank-5. same for 12,13 rows. So this function always returns consecutive numbers. If you want apply DENSE_RANK() by department wise, we can use PARTITION BY clause. PARTION BY works like GROUP BY in aggregates!
Views: 1438 WingsOfTechnology
PIVOT and UNPIVOT Operators in Oracle Database 11g
 
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A quick example of using the PIVOT and UNPIVOT operators introduced in Oracle Database 11g. For more information see: https://oracle-base.com/articles/11g/pivot-and-unpivot-operators-11gr1 Website: https://oracle-base.com Blog: https://oracle-base.com/blog Twitter: https://twitter.com/oraclebase Cameo by Moans Norgaard Blog: http://wedonotuse.blogspot.co.uk/ Twitter: https://twitter.com/mnorgaard Cameo appearances are for fun, not an endorsement of the content of this video.
Views: 9281 ORACLE-BASE.com
RANK Analytic Function in SQL with an Example
 
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RANK() Analytic Function: RANK calculates the rank of a value in a group of values. The return type is NUMBER. If two or more rows tie for a rank, each tied rows receives the same rank. For example, if the two top employees have the same salary value, they are both ranked one. The employee with the next highest salary is ranked number three, because there are two rows that are ranked higher. Therefore, the RANK function does not always return consecutive integers. The sort order that is used for the whole query determines the order in which the rows appear in a result set. PARTITION BY clause: Divides the query result set into partitions. The window function is applied to each partition separately and computation restarts for each partition. ORDER BY clause: Defines the logical order of the rows within each partition of the result set. That is, it specifies the logical order in which the window functioncalculation is performed. Query used in Video: select ename,sal,deptno,RANK() OVER(PARTITION BY deptno ORDER BY sal) from emp; Video Explanation: See here 6th row assigned the value '6',not '5' because 4th and 5th rows have same value for salary. Its the same for 12 and 13 rows also. we did not mention anything on OVER clause except ORDER BY. If you want apply RANK() by department wise, we can use PARTITION BY clause. PARTION BY works like GROUP BY in aggregates!
Views: 6736 WingsOfTechnology
Identify and Delete Duplicate records (rows) - SQL Server
 
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Identify and Delete Duplicate records/rows. Check and get the script here in my blog: http://sqlwithmanoj.com/2011/10/14/identify-delete-duplicate-records-from-a-table/ For more updates like my page in FB: https://www.facebook.com/sqlwithmanoj
Views: 21584 SQL with Manoj
SQL Tutorials  in Urdu Hindi  How To Use SELECT TOP CLAUSE Statement in SQL in Urdu Hindi
 
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The SELECT TOP clause is used to return the top X numbers or N Percent row from the table. Only MSSQL server and MS Access database support the SELECT TOP clause. To fetch limited number of records, LIMIT clause is used in MySQL database & ROWNUM in Oracle database
09- ORDER BY Clause In SQL SERVER In HINDI | How To Use Order By In SQL SERVER In HINDI | ORDER By
 
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The SQL ORDER BY Keyword: The ORDER BY Clause is used in SQL SERVER to sort the retrieved data in ascending or descending order. The ORDER BY keyword sorts the records in ascending order by default. To sort the records in descending order, use the DESC keyword. Website: http://www.tutorialsspace.com 05- SELECT Command In SQL Server | Select Statement In SQL SERVER In HINDI | Select Querry In SQL https://youtu.be/y4oibD0P78c 06- How To Set PRIMARY Key To Existing COLUMN In SQL SERVER | Primary Key Constraint In SQL Server https://youtu.be/N0kwJ2qyX0A 07- DISTINCT keyword in SQL SERVER 2008 In Hindi | DISTINCT keyword in SQL SERVER https://youtu.be/T_M7Wg0iYf0 08- WHERE Statement In SQL SERVER | How To Use Where In SQL Server | Where Clause In SQL SERVER https://youtu.be/g9OpiTRQrqI
Views: 253 tutorialsspace
SQL TUTORIALS : How to join 2 column in sql
 
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how to use Concatenation operator in sql plus. How to join 2 columns with the help of concatenation operator
Views: 9166 learnoracle9i
Stored Procedure Optimization Techniques
 
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Kimberly will discuss stored procedure caching and the potential for performance problems due to a problem known as parameter sniffing. There are some common solutions and while they can drastically improve performance, they can also cause other problems. Sometimes a hybrid solution is needs, from this session, you’ll know the best way to write procedures so that stable requests are cached and unstable requests are not (giving you the most optimal performance without wasting resources). Kimberly Tripp Kimberly’s an author, consultant, and top-rated speaker having spoken at PASS, TechEd, SQLintersection, and numerous other events around the world; she’s also been a Microsoft SQL Server MVP for over 10 years. She has over 25 years of experience designing and tuning SQL Server solutions with a focus on optimizing procedural code, indexing strategies, statistics, and partitioning. When she's not tuning SQL servers, she's diving and photographing all sorts of underwater critters such as frogfish with her husband, Paul S. Randal.
Views: 6186 DBAFundamentals
VB.NET - Copy rows between data tables
 
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Here is the code you can use to copy rows from one data table to another. VB.NET - Copy rows between data tables ----------------------------------------------- Dim tableOld As New DataTable 'Create 2 columns tableOld.Columns.Add("ProductID", GetType(Integer)) tableOld.Columns.Add("ProductName", GetType(String)) 'Add 2 rows tableOld.Rows.Add(111, "Apple") tableOld.Rows.Add(112, "Orange") Dim tableNew As New DataTable 'Copy table structure of tableOld to tableNew tableNew = tableOld.Clone() Dim rowNumber As Integer = 1 'Change the row number as needed tableNew.ImportRow(tableOld.Rows(rowNumber)) 'Copies a certain row of tableOld into tableNew 'You can only copy an exact row into another table using this approach if both of them have the same table structure. 'That is why we used the Clone() method to copy the table structure. MessageBox.Show(tableNew.Rows(0).Item("ProductID") & ": " & tableNew.Rows(0).Item("ProductName"))
Views: 3217 KnowledgeIsCool
Cursor Leak in Java - JDBC code.
 
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This video explains about Cursor Leak in java jdbc code and how to fix it. The exception is known as ORA-01000 Maximum Open Cursors Exceeded exception || By || Krishna Nimmaraju
Views: 219 Krishna Nimmaraju
Parallelism & Partitioning Techniques : Video 7 (HD)
 
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Explains Parallel Processing Environments (SMP, MPP architecture)*, Parallelisms (Pipeline, Partition), Types of Partition Techniques* (Round-Robin, Hash, Entire, Same, Auto, Range, Random, DB2, Modulus) and RCP (Run-time Column Propagation) Now need to worry about searching my videos. Added videos to my playlist and here's the link......... http://www.youtube.com/playlist?list=PLeF_eTIR-7UpGbIOhBqXOgiqOqXffMDWj
Views: 57027 Tutorial

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