SELECT子句及其順序：

SELECT -- FROM --? WHERE -- GROUP BY -- HAVING -- ORDER BY -- LIMIT

HAVING 用于GROUP BY之后，常一起搭配使用。

HAVING 是在GROUP BY 分組之后的二次篩選。

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?栗子：

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代碼：

select title,count(title) as t from titles group by title having t>=2;

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---

代碼;

select title, count( distinct emp_no ) as t from titles group by title having t>=2;

?

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