Question

I have a table in SqlServer 9 with data of the form

Code    Number J       0 J       5 J       8 Y       2 Y       8 

I’d like to add a column that has a number with the internal sequence of numbers for each code, so that my table looks like this;

Code    Number   Seq J       0        1 J       5        2 J       8        3 Y       2        1 Y       8        2 

Does anyone have any suggestions as to the best way to accomplish this?

Answer 1

Look at the ROW_NUMBER() function.

DECLARE @Number TABLE (     Code        nvarchar(1) ,   Number      int )   INSERT @Number VALUES ('J', 0) INSERT @Number VALUES ('J', 5) INSERT @Number VALUES ('J', 8) INSERT @Number VALUES ('Y', 2) INSERT @Number VALUES ('Y', 8)   SELECT * FROM @Number   SELECT  Code ,       Number ,       ROW_NUMBER() OVER(PARTITION BY Code ORDER BY Code) AS Seq FROM    @Number