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Posted by DE on 01/28/07 06:50
Hi,
New to SQL. Got some questions about it.
Suppose I have two tables. Each of them has a single column, named as
c1. For table T1, I have:
1
1
1
3
3
5
7
9
For table T2, I have:
1
2
3
4
5
1
3
The exercise I want to do is to select the number of occurence in T1
for those elements in T2. For above tables, I want to show:
1 3 ( i.e. "1" is in T2 and shows 3 times in T1)
2 0 (i.e. "2" is in T2 but doesn't show in T1)
3 2 (i.e. "3" is in T2 and show 2 times in T1)
It seems I can't figure out a good way to do this. Any help will be
appreciated.
Thanks
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