having在Oracle和mysql中的一点不同点 - mysql数据库栏

在Oracle中，having一定要结合group by使用，但在 mysql 中，情况就不一样了，可以单独使用。

C:\Documents and Settings\guogang>sqlplus test/test

SQL*Plus: Release 10.2.0.1.0 - Production on 星期二 8月 12 09:09:58 2014 Copyright (c) 1982, 2005, Oracle . All rights reserved. 连接到: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options SQL> select * from test1 having owner ='SYS'; select * from test1 having owner ='SYS' * 第 1 行出现错误:

ORA-00979: 不是 GROUP BY 表达式

SQL> select owner,count(1) from test1 group by owner having owner ='SYS'; OWNER COUNT(1) ------------------------------ ----------

mysql> select * from test having id>98; +------+-------------+ | id | create_time | +------+-------------+ | 99 | 2014-08-12 | | 100 | 2014-08-12 | +------+-------------+ 2 rows in set (0.00 sec)

mysql> select id,count(1) from test group by id having id>98; +------+----------+ | id | count(1) | +------+----------+ | 99 | 1 | | 100 | 1 | +------+----------+ 2 rows in set (0.00 sec)

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