SELECT COUNT(*), A, B
FROM ...
WHERE ...
GROUP BY A, B
HAVING COUNT(*) = 1
Z. Martinez <zlm101_at_psu.edu> schrieb im Beitrag
<334bd241.9605767_at_news.cac.psu.edu>...
>
> I have a large table (about 4 million rows) that I need to search
> through. Although the query I'm using can result to multiple rows, I
> only need the first matching row. This query will be executed probably
> a hundred thousand times. So I really need to optimize it
>
> What is the most efficient way of getting the first matching record
> PL/SQL? and Pro*C?
>
> Thanks in advance.
>
> Please send your response to zlm101_at_psu.edu
>
>
>
Received on Wed Apr 09 1997 - 00:00:00 CDT
