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Row Number function in SQL Server

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sql server row_number example sql server row number by partition sql server row_number over partition by order by In this video we will discuss Row_Number function in SQL Server. This is continuation to Part 108. Please watch Part 108 from SQL Server tutorial before proceeding. Row_Number function Introduced in SQL Server 2005 Returns the sequential number of a row starting at 1 ORDER BY clause is required PARTITION BY clause is optional When the data is partitioned, row number is reset to 1 when the partition changes Syntax : ROW_NUMBER() OVER (ORDER BY Col1, Col2) Row_Number function without PARTITION BY : In this example, data is not partitioned, so ROW_NUMBER will provide a consecutive numbering for all the rows in the table based on the order of rows imposed by the ORDER BY clause. SELECT Name, Gender, Salary, ROW_NUMBER() OVER (ORDER BY Gender) AS RowNumber FROM Employees Please note : If ORDER BY clause is not specified you will get the following error The function 'ROW_NUMBER' must have an OVER clause with ORDER BY Row_Number function with PARTITION BY : In this example, data is partitioned by Gender, so ROW_NUMBER will provide a consecutive numbering only for the rows with in a parttion. When the partition changes the row number is reset to 1. SELECT Name, Gender, Salary, ROW_NUMBER() OVER (PARTITION BY Gender ORDER BY Gender) AS RowNumber FROM Employees Use case for Row_Number function : Deleting all duplicate rows except one from a sql server table. Discussed in detail in Part 4 of SQL Server Interview Questions and Answers video series. Text version of the video http://csharp-video-tutorials.blogspot.com/2015/09/rownumber-function-in-sql-server.html Slides http://csharp-video-tutorials.blogspot.com/2015/09/rownumber-function-in-sql-server_30.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 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
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Text Comments (28)
Loay Oraby (16 hours ago)
thanx alot your videos is helping me
Brindha Ganesan (20 days ago)
Cystal clear explanation!
Ashutosh Hegde (1 month ago)
thank you Venkat Sir
Evgeny R (2 months ago)
Great!! Thanks!
Monsieur Green (4 months ago)
This helped me a lot, thanks!
this (4 months ago)
very helpful thanks kudvenkat!
dollar menu (5 months ago)
well explained
Moshir Fakhoury (8 months ago)
Hi, thanks for the video, this seems like a very simple function, i have tried it and it seems like its working by its actually returning an empty column, this is my exact code: ROW_NUMBER() OVER (PARTITION BY orddet_nl.invnum ORDER BY orddet_nl.invnum ASC) AS LineReference, i dont get any error messages or anything, but it just brings an empty column, any ideas why? Thanks
jaspreetdandiwal (10 months ago)
very good video, flawless
William Harrison (11 months ago)
Great video. Could you also use Row_Number as a means to replace a cursor? How would that effect query performance?
Amit Bhardwaj (1 year ago)
I am using SQL community version 5.5.57, Could you please tell me why i am getting below error? Thanks in advance:) mysql> select * from userinfo; +---------+----------+---------+ | loginId | password | access | +---------+----------+---------+ | z011111 | A1 | User | | z021720 | ram99 | Manager | | z021721 | demo | User | +---------+----------+---------+ 5 rows in set (0.00 sec) mysql> select *, row_number() over(order by loginId) as rowNumber from userinfo; ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '(order by loginId) as rowNumber from userinfo' at line 1
Thup Tenpa (1 year ago)
GREAT TEACHER! I have been using your videos to reference SQL where I have no clues. Thanks for all your hard works!
Rifaqat Ullah (1 year ago)
Wonderful
Paul Lockey (1 year ago)
I have seen several of you videos that reference Partition. What does that do?
Krzysztof S (1 year ago)
Row number rules ! And Venkat rules! You are the best teacher on youtube and in the whole world. I saw all your videos from SQL Server tutorial. Thank U for educating community! God bless you.
Mahendra Singh Baghel (1 year ago)
can we use one more where clause with row number...?
MrHorzel (1 year ago)
Really well explained. Thank you. I really appreciate that you explained the use of it, more people should add that 'cause it's not always clear.
kudvenkat (1 year ago)
You are very welcome and thank you very much for taking time to give feedback. This means a lot. I am very glad you found the videos useful. I have organised all the Dot Net & SQL Server videos in to playlists, which could be useful to you https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd If you need DVDs or to download all the videos for offline viewing please visit http://www.pragimtech.com/kudvenkat_dvd.aspx Slides and Text Version of the videos can be found on my blog http://csharp-video-tutorials.blogspot.com Tips to effectively use my youtube channel. https://www.youtube.com/watch?v=y780MwhY70s If you want to receive email alerts, when new videos are uploaded, please subscribe to my youtube channel. http://www.youtube.com/subscription_center?add_user=kudvenkat If you like these videos, please click on the THUMBS UP button below the video. May I ask you for a favor. I want these tutorials to be helpful for as many people as possible. Please share the link with your friends and family who you think would also benefit from them. Good Luck Venkat
Lenin Mishra (2 years ago)
Hi Venkat, I have data that has following rows.... 2934046 Kellogg’s Share Your Breakfast 74672 2407522 Kellogg?s Share Your Breakfast ACTIVE 2015-09-01 9999-12-31 2934046 Kellogg?s Share Your Breakfast 74672 2407522 Kellogg?s Share Your Breakfast ACTIVE 2015-09-01 9999-12-31 You can see that both rows are the same except for the question mark in the second row. I have to remove such rows from my table. I was trying to use row_number for this, but it doesn't work. Is there any way i can rank such rows based on the characters in my second column...
ADG (2 years ago)
What if you only want to return the row with the max row number?
ADG (1 year ago)
archrodney thanks
archrodney (1 year ago)
-- This query will give you 1 row with the max row number: SELECT TOP 1 *, ROW_NUMBER()OVER(PARTITION BY ID ORDER BY ID) AS RowNumber FROM Employees ORDER BY RowNumber DESC; -- This query will give you ALL rows with the max row number: WITH RowNumberCTE AS ( SELECT *, ROW_NUMBER()OVER(PARTITION BY ID ORDER BY ID) AS RowNumber FROM Employees ) SELECT * FROM RowNumberCTE WHERE RowNumber = (SELECT TOP 1 * FROM (SELECT ROW_NUMBER() OVER (PARTITION BY ID ORDER BY ID) AS RowNumbers FROM Employees) DerivedTable ORDER BY RowNumbers DESC) -- I know it's not a nice piece of code but it does the job.
dev forever (2 years ago)
Great channel, please keep doing these videos. You are the teacher i never had.
Wasim Bader (2 years ago)
I have sent an email and still waiting for reply. Thumbs up for this video.
Ramachandran M (3 years ago)
nice sir..i watch your ASP and SQL video Series
raqibul1000000 Alam (3 years ago)
Thanks.
Kostas Greek (3 years ago)
Great
majid sultan (3 years ago)
thank you very good

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