delete from Person where id in (select max(id) from person group by Email having count(*)>1);
在练习sql时 报错。
原因delete和select不能同时执行 使用笛卡尔积自关联表 筛选出条件
DELETE p1.*
FROM Person p1,
Person p2
WHERE
p1.Email = p2.Email AND p1.Id > p2.Id
qq59cc601f169b1 ©著作权
delete from Person where id in (select max(id) from person group by Email having count(*)>1);
在练习sql时 报错。
原因delete和select不能同时执行 使用笛卡尔积自关联表 筛选出条件
DELETE p1.*
FROM Person p1,
Person p2
WHERE
p1.Email = p2.Email AND p1.Id > p2.Id
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