MySQL数据库不支持关键字及替换语句，持续更新

1、MYSQL不支持LIKE ‘^[a]’

SELECT * FROM sys_user WHERE USER_CD LIKE '^[a]' ORDER BY USER_CD

上面SQL语句返回空，替换语句：

SELECT * FROM sys_user WHERE USER_CD RLIKE '^[au]' ORDER BY USER_CD

查询USER_CD以a和u开头的数据

2、MYSQL不支持TOP

SELECT TOP 10 * FROM sys_user ORDER BY USER_CD

会报错，替换语句：

SELECT * FROM sys_user ORDER BY USER_CD LIMIT 10

3、MYSQL不支持FULL JOIN

SELECT * FROM sys_user U FULL JOIN sys_user_info I ON U.SEQ_ID = I.SEQ_ID ORDER BY USER_CD

会报错，替换语句：

SELECT U.USER_NAME, U.DEL_FLAG, I.ADDRESS FROM sys_user U LEFT JOIN sys_user_info I ON U.SEQ_ID = I.USER_SEQ_ID 
UNION ALL 
SELECT U.USER_NAME, U.DEL_FLAG, I.ADDRESS FROM sys_user U RIGHT JOIN sys_user_info I ON U.SEQ_ID = I.USER_SEQ_ID 

如果要用full join，通过联合查询，将左外和右外连接的结果集联合在一起，就可以达到full join的效果了。

4、MYSQL不支持SELECT INTO

SELECT SEQ_ID, USER_CD, USER_NAME INTO sys_user_back FROM sys_user WHERE USER_CD LIKE 'admin%'

会报错，替换语句：

INSERT INTO sys_user_back(SEQ_ID, USER_CD, USER_NAME, PASSWORD, SALT) SELECT SEQ_ID, USER_CD, USER_NAME, PASSWORD, SALT FROM sys_user WHERE USER_CD LIKE 'admin%'

可在插入的时候加入查询语句，这样需保证插入列一致