MYSQL:HAVING

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SELECT子句及其顺序：

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 分组之后的二次筛选。

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 栗子：

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代码：

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

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代码;

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