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誰能告訴我之間的差異HAVING和WHERE中,當我得到同時使用相同的結果,這正好與WHERE子句中的語句差異WHERE子句
SELECT Table1.DEPT, Sum(Table1.SALARY) AS Comp
FROM Table1
GROUP BY Table1.DEPT
HAVING DEPT="HR"
以下方面的條款。
SELECT Table1.DEPT, Sum(Table1.SALARY) AS Comp
FROM Table1
WHERE DEPT="HR"
GROUP BY Table1.DEPT
選中此項:http://stackoverflow.com/questions/287474/whats-the-difference-between-having-and-where – Toster
如果您忽略group by子句,您將得到不同的結果 – apomene