mysql基本錯誤

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

輸入命令有誤，存在mysql無法識別的命令。

ERROR:
No query specified

sql語法不合法，如多加了分號。

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

該記錄已經存在。