HAVING&WHERE
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在where子句中,是不能用聚集函数作为条件表达式的,例如:
SELECT Sno,AVG(Grade)
FROM SC
WHERE AVG(Grade)>=90
GROUP BY Sno
上述语句是不对的。
正确的应是:
SELECT Sno,AVG(Grade)
FROM SC
GROUP BY Sno
HAVING AVG(Grade)>=90
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