enumerating row number - SQL Server Forums

Please start any new threads on our new site at https://forums.sqlteam.com. We've got lots of great SQL Server experts to answer whatever question you can come up with.

All Forums

General SQL Server Forums

New to SQL Server Programming

enumerating row number

Author

Topic

slimt_slimt
Aged Yak Warrior

746 Posts

Posted - 2013-01-10 : 07:46:17

Hi,

I have two columns c1 and c2:

c1 c2
1 1
2 0
3 0
4 1
5 1
6 0
7 0
8 0
9 0
10 1
11 0
12 0

what i want is to get column c3 which will enumerate each part of "pairs" between 1 and next 1.
so result for C3:

c1 c2 c3
1 1 1
2 0 2
3 0 3
4 1 1
5 1 1
6 0 2
7 0 3
8 0 4
9 0 5
10 1 1
11 0 2
12 0 3

thank you

sunitabeck
Master Smack Fu Yak Hacker

5155 Posts

Posted - 2013-01-10 : 09:56:22

See if this will work for you

SELECT
	t.c1,t.c2,t.c1-(t2.n-1) AS c3
FROM
	Tbl t
	CROSS APPLY
	( 
		SELECT MAX(c1) AS n FROM Tbl t2
		WHERE t2.c1 <= t.c1 AND t2.c2 = 1
	) t2;

Subscribe to SQLTeam.com

SQLTeam.com Articles via RSS

SQLTeam.com Weblog via RSS

- Advertisement -

Resources