mysql基本错误

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 'linit
 3,3' at line 1

输入命令有误，存在mysql无法识别的命令。

ERROR:
No query specified

sql语法不合法，如多加了分号。

ERROR 1062 (23000): Duplicate entry '999' for key 1

该记录已经存在。