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slimt_slimt
Aged Yak Warrior

Switzerland
746 Posts
Posted - 01/10/2013 :  07:46:17  Show Profile  Reply with Quote
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
Flowing Fount of Yak Knowledge

5152 Posts
Posted - 01/10/2013 :  09:56:22  Show Profile  Reply with Quote
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;
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