DELETE p1 FROM Person p1,
Person p2
WHERE
p1.Email = p2.Email AND p1.Id > p2.Id
Q:为什么是DELETE p1 FROM 而不是直接DELETE FROM呢?
如果用了表别名,delete后要加别名
DELETE p1 FROM Person p1,
Person p2
WHERE
p1.Email = p2.Email AND p1.Id > p2.Id
Q:为什么是DELETE p1 FROM 而不是直接DELETE FROM呢?
如果用了表别名,delete后要加别名