具有多个条件的 PDO sql 删除

Question

这是我尝试过的：

$query="DELETE FROM network_friend WHERE friend_request = :usrfriend AND friend = :isfriend UNION DELETE FROM network_friend WHERE friend_request = :friend_request AND friend = :friendisfriend";

---

我有列结构

结构相同，而不是

friend1 friend2 friend1

可能是这样的

friend2 friend1 friend2 

如果列：friend_request 或 friend_is_friend 是否是同一个用户，并且 friend 列是我要删除的用户，如何删除案例？

类似"DELETE FROM table WHERE friend = :user1 AND friend_request = :user2 AND friend_is_friend = :user2"

反之亦然

"DELETE FROM table WHERE friend = :user2 AND friend_request = :user1 AND friend_is_friend = :user1"

问题是我需要删除大小写 user1 = friend_request 和 user1 friend_is_friend 以及 friend = user2 倒数也可以代替 user 1 user 2 和 user 2 user 1

如何删除多个条件并将其变为单个语句？

Answer 1

我想你想要：

DELETE nf FROM network_friend nf
    WHERE (friend_request = :usrfriend AND friend = :isfriend) OR
          (friend_request = :friend_request AND friend = :friendisfriend)

Answer 2

我觉得是=D

$sql = 'DELETE FROM network_friend WHERE friend_request = friend_is_friend AND friend = :user_you_want_to_delete';