大神们，帮我看看
我创建一个视图，在视图里用union怎么报错啊！语句为：
CREATE VIEW mainview(MID)
AS
((SELECT ID FROM student)
UNION (SELECT ID FROM teacher));
错误信息为：ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that
corresponds to your MySQL server version for the right syntax to use near 'UNION
(SELECT ID FROM teacher))' at line 4

student.ID和teacher.ID 没问题的。这是什么情况啊！我mysql服务器是：mysql-connector-net-6.4.4.msi!
请大侠们帮忙啊！

[解决办法]
试一下这个，另外你的MYSQL版本是多少？

create view mainview
as
select SELECT ID FROM student
union
SELECT ID FROM teacher

[解决办法]
mysql> create view v_test as select * from test1 union select * from test1;
Query OK, 0 rows affected (0.05 sec)
[解决办法]
CREATE VIEW v_test AS SELECT * FROM aa UNION SELECT * FROM aa;
在5.5.32中没有问题