Mysql having用法

having子句對我們篩選分組後的數據非常方便

語法：

group by 字段 having 條件判斷;

SELECT dept,COUNT(user_name) count_tmp FROM table GROUP BY dept HAVING count_tmp >1;

注意：having後面跟的條件判斷的字段必須是聚合函數返回的結果，否則sql會報錯：