mysql的sql语句特殊处理语句总结(必看)

UPDATE ot_tgbz set update_day=if(update_day is null,date,update_day);

UPDATE ot_user set xingyun_num=if(xingyun_num > 2,2,xingyun_num);

update shop_goods  set thumb= replace (thumb,'http://www.vevb.com/','') where thumb like '%http://www.vevb.com/%';

$map= " CAST(  `UE_account` AS CHAR CHARACTER     SET utf8  ) LIKE '%$data%'  OR CAST(    `UE_accName` AS CHAR CHARACTER    SET utf8  ) LIKE '%$data%'  OR CAST(    `UE_truename` AS CHAR CHARACTER    SET utf8  ) LIKE '%$data%'  OR CAST(    `UE_phone` AS CHAR CHARACTER    SET utf8  ) LIKE '%$data%'";