数据库表字段不要用关键词 保留词

UPDATE `cns_rob` SET `left`=left-1 WHERE ( `id` = 1 ) AND ( `status` = 1 );

[Err] 1064 - 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 '-1 WHERE ( `id` = 1 ) AND ( `status` = 1 )' at line 1