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Hi, I have a table of the form
aid cid
- ---- -----
1 123
2 456
3 667
3 879
3 123
4 878
4 456
4 123
5 999
5 667
5 879
My goal is to identify for each pair of cid values, the number of
times they have the same aid
Thus for example I would have
pair count
- ---- -----
123 & 456 1
667 & 879 2
...
I currently do this by using a Python script to do a pairwise lookup, as
select count(aid) where cid = 123 and cid = 456;
but I was wondering whether I could construct a single SQL statement
to do this.
Any pointers would be appreciated,
Thanks,
- -------------------------------------------------------------------
Rajarshi Guha <rguha@xxxxxxxxxxx>
GPG Fingerprint: D070 5427 CC5B 7938 929C DD13 66A1 922C 51E7 9E84
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All great discoveries are made by mistake.
-- Young
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