GROUP BY HAVING,ORDER BY

--HAVING语句与GROUP BY语句联合使用，用来过滤由GROUP BY语句返回的记录集。
--并且HAVING语句的存在弥补了WHERE关键字不能与聚合函数联合使用的不足。
SELECT COUNT(1),
       SUM([COLUMN_NAME]),
       MAX([COLUMN_NAME]),
       MIN([COLUMN_NAME]),
       [COLUMN_NAME],
       ...
       FROM [TABLE_NAME]
       GROUP BY [COLUMN_NAME]
       HAVING [COLUMN_NAME] > [SIZE]
       AND [COLUMN_NAME] = [SIZE]
       ORDER BY [COLUMN_NAME] [DESC/ASC];
--EG：
SELECT COUNT(1),
       S.SEX,
       S.U_NUMBER
       FROM USERS S
       GROUP BY S.SEX,S.U_NUMBER
       HAVING S.U_NUMBER > 3
       AND S.U_NUMBER = 6
       ORDER BY S.U_NUMBER DESC;