备份数据重复的数据库sql删除操作

两张表做笛卡尔积， 利用笛卡儿积的方法进行去重 。逻辑删除update，或直接删除delete

update   eepm_engineer_pro_implement set state=2 where id in (
select   p1.id
FROM eepm_engineer_pro_implement p1,eepm_engineer_pro_implement p2
WHERE
    p1.guid = p2.guid AND p1.id > p2.id
    and p1.histortydate like '2020-03-06%'  and p1.state =1  
    and p2.histortydate like '2020-03-06%'  and p2.state =1 
    );

来源：oschina

链接：https://my.oschina.net/suncici1101/blog/3190804