having在Oracle和MySQL中不一样的地方

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 Settingsguogang>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）
------------------------------ ----------

SYS 30754mysql> 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）Oracle 11g 在RedHat Linux 5.8_x64平台的安装手册 http://www.linuxidc.com/Linux/2014-07/104745.htmLinux-6-64下安装Oracle 12C笔记 http://www.linuxidc.com/Linux/2013-07/86805.htm在CentOS 6.4下安装Oracle 11gR2（x64） http://www.linuxidc.com/Linux/2014-02/97374.htmOracle 11gR2 在VMWare虚拟机中安装步骤 http://www.linuxidc.com/Linux/2013-09/89579p2.htmDebian 下安装 Oracle 11g XE R2 http://www.linuxidc.com/Linux/2014-03/98881.htm更多Oracle相关信息见Oracle 专题页面 http://www.linuxidc.com/topicnews.aspx？tid=12本文永久更新链接地址