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 auto increment - group by		  New Topic  Reply to Topic
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cenzor
Starting Member

1 Posts
Posted - 06/17/2012 :  14:05:20  Show Profile  Reply with Quote
Hello All,

I would like to ask how to autoincrement integer value in a column based on the value in other column. I.e. if the value changes the incrementation should start again.

E.g. I have a table with column A and B. Column B is blank
And A has the following values:

A B
x
x
x
y
y
z
z
z
z

And I would like to update the column in the following way:

A B
x 10
x 20
x 30
y 10
y 20
z 10
z 20
z 30
z 40

Thank you!

Jan

tkizer
Almighty SQL Goddess

USA
35007 Posts
Posted - 06/17/2012 :  14:38:43  Show Profile  Visit tkizer's Homepage  Reply with Quote
Check out the ROW_NUMBER() function.

Tara Kizer
Microsoft MVP for Windows Server System - SQL Server
http://weblogs.sqlteam.com/tarad/

Subscribe to my blog
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visakh16
Very Important crosS Applying yaK Herder

India
47023 Posts
Posted - 06/17/2012 :  16:49:37  Show Profile  Reply with Quote 

UPDATE t
B = Seq * 10
FROM 
(
SELECT ROW_NUMBER() OVER (PARTITION BY A ORDER BY (SELECT 1)) AS Seq
FROM  Table
)t


------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/
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