having在Oracle和mysql中的一点不同点_MySQL

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本文来源gaodai#ma#com搞@@代~&码*网/ 星期二 8月 12 09:09:58 2014
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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)
—————————— ———-

SYS 30754

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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