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? SQL ?? ??? '?? ??? EXISTS? ???? ?? ?? ?? ??? ??? ???? ??? ? ?????'? ???? ??? ??????
? SQL ?? ??? '?? ??? EXISTS? ???? ?? ?? ?? ??? ??? ???? ??? ? ?????'? ???? ??? ??????
Jan 11, 2025 pm 01:26 PM
SQL ?? ?? ??: SELECT ??? ?? ???
? SQL ??? ??? ?????:
select count(distinct dNum)
from myDB.dbo.AQ
where A_ID in
(SELECT DISTINCT TOP (0.1) PERCENT A_ID,
COUNT(DISTINCT dNum) AS ud
FROM myDB.dbo.AQ
WHERE M > 1 and B = 0
GROUP BY A_ID ORDER BY ud DESC)
"EXISTS? ?? ??? ???? ?? ?? ?? ??? ??? ???? ??? ? ????."?? ?? ???? ?? ??? SELECT ?? ??? ??? ?????. ?? ??? A_ID ? COUNT(DISTINCT dNum)?? ? ?? ?? ????? ?????. IN(?? =, != ?? ?? ?? ?? ???)? ??? ? ?? ??? SELECT ???? ?? ?? ????? ???.
???:
??? ??? ?? ???? A_ID? ???? ???.
select count(distinct dNum) from myDB.dbo.AQ where A_ID in (SELECT DISTINCT TOP (0.1) PERCENT A_ID FROM myDB.dbo.AQ WHERE M > 1 and B = 0 GROUP BY A_ID) ORDER BY COUNT(DISTINCT dNum) DESC;
?? ?? ??:
- ?? ???
SELECT??? ??A_ID? ?????. - ???? ?? ?? ?? ??
ORDER BY?? ?? ??? ???????. ?? ??ORDER BY?IN?? ???? ?? ?? ?? ??? ????? ???? ?????. ??? ?? ?? ??? ????? ???.
? ??? ??? ?? ?? ???? dNum? ??? ?? A_ID ?? ??? ???? ?????. ?? ??? ?? A_ID ??? ???? dNum ?? ?? 10%? ????? ????, ?? ??? ??? dNum? ??? ?? A_ID ?? ?????. ??? ORDER BY ?? ??? dNum ?? ??? ???? ??? ?????.
? ??? ? SQL ?? ??? '?? ??? EXISTS? ???? ?? ?? ?? ??? ??? ???? ??? ? ?????'? ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!
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