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 |
+----+--------+-----+---------+---------+