当我执行此查询时，我收到此错误消息“错误代码：1172。结果包含多个行”
1
729CREATE DEFINER=`root`@`localhost` PROCEDURE `un_follow`(
user_been_following_id int,
user_following_id int
)
BEGIN
declare id int;
select following_id into id from user_following
where user_been_following_id = user_been_following_id
and user_following_id = user_following_id;
delete from user_following
where following_id = id;
END
id 是下表的主键有帮助吗？
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