MySQL EXPLAIN:Impossible WHERE noticed after re...
mysql的explain命令用于查看执行效果,好久没有来分析sql了(ps:有段时间没写SQL了)无解……还好,有google。mysql>createtablet_william(idintprimarykey,namechar(2))engine=innodb;
QueryOK,0rowsaffected(0.13sec)/*上两条数据*/
insertintot_williamvalue