日期:2014-05-16  浏览次数:20716 次

MYSQL 去除重复 记录
删除旧
delete from a  using mix_crm_contact   as a,mix_crm_contact  as b where a.id<b.id and a.`telphone_num` = b.`telphone_num`
删除新
delete from a  using mix_crm_contact   as a,mix_crm_contact  as b where a.id>b.id and a.`telphone_num` = b.`telphone_num`