HAVING子句允许您指定过滤器的条件，分组结果会出现在最终结果。
WHERE子句所选列的条件，而由GROUP BY子句条件创建分组的HAVING子句。
语法
下面是HAVING子句在查询中的位置：
SELECT FROM WHERE GROUP BY HAVING ORDER BY
HAVING子句必须遵循GROUP BY子句中的查询，如果使用也必须先于ORDER BY子句。 下面是SELECT语句，包括HAVING子句的语法：
SELECT column1, column2 FROM table1, table2 WHERE [ conditions ] GROUP BY column1, column2 HAVING [ conditions ] ORDER BY column1, column2
例子：
考虑CUSTOMERS表具有以下记录：
+----+----------+-----+-----------+----------+ | ID | NAME | AGE | ADDRESS | SALARY | +----+----------+-----+-----------+----------+ | 1 | Ramesh | 32 | Ahmedabad | 2000.00 | | 2 | Khilan | 25 | Delhi | 1500.00 | | 3 | kaushik | 23 | Kota | 2000.00 | | 4 | Chaitali | 25 | Mumbai | 6500.00 | | 5 | Hardik | 27 | Bhopal | 8500.00 | | 6 | Komal | 22 | MP | 4500.00 | | 7 | Muffy | 24 | Indore | 10000.00 | +----+----------+-----+-----------+----------+
下面是示例，这将显示记录age大于或等于2的数据量：
SQL > SELECT ID, NAME, AGE, ADDRESS, SALARY FROM CUSTOMERS GROUP BY age HAVING COUNT(age) >= 2;
这将产生以下结果：
+----+--------+-----+---------+---------+ | ID | NAME | AGE | ADDRESS | SALARY | +----+--------+-----+---------+---------+ | 2 | Khilan | 25 | Delhi | 1500.00 | +----+--------+-----+---------+---------+
