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                **`having` 與 `where` 不同點:** (1)`where` 針對表中的列發揮作用,查詢數據;`having` 針對查詢結果中的列發揮作用,篩選數據。 (2)`where` 后面不能寫聚合函數,而 `having` 后面可以使用聚合函數。 (3)`having` 只用于 `group by` 分組統計語句。 ```sql -- 求每個部門的平均工資 select deptno, avg(sal) from emp group by deptno; -- 求每個部門的平均薪水大于 2000 的部門 select deptno, avg(sal) avg_sal from emp group by deptno having avg_sal > 2000; ```
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