根据两个不同表中的条件删除两个表中的行

Question

长时间观看，第一次提问

我目前正在做一些事情，我必须根据两个不同表上的条件删除两个表上的数据。我只是 SQL 的初学者，这已经困扰了我一上午。

这两个条件是客户表中的GDPR已设置为N，以及支付交易表中的支付日期大于30天

create proc MemberDelete

delete from ClientsPersonalInfo
from Clients, PaymentTransaction
where ClientsPersonalInfo.ClientID = Clients.ClientID and Clients.GDPR = 'N' and (select datediff(dd,PaymentDate,GETDATE()) from PaymentTransaction)>30

delete from GymCard
from Clients, PaymentTransaction
where GymCard.ClientID = Clients.ClientID and Clients.GDPR = 'N' and (select datediff(dd,PaymentDate,GETDATE()) from PaymentTransaction)>30

If @@rowcount <>1
rollback

else 
Commit

真的不知道我在哪里做错了吗？我得到的错误是以下“子查询返回超过 1 个值。当子查询遵循 =、!=、、>= 或将子查询用作表达式时，这是不允许的。”

Proc 的重点是如果 ClientPersonalInfo 和 GymCard 的 ClientID 符合 Clients 和 PaymentTransaction 表中的两个条件，则硬删除数据。这是因为客户没有勾选 GDPR 框以便我们保留信息，并且他们的最后付款日期超过 30 天。

Answer 1

您必须使用 ClientID 加入 PaymentTransaction。

您还需要通过 PaymentTransaction 加入 GymCard。

create proc MemberDelete

delete from ClientsPersonalInfo
from Clients, PaymentTransaction
where 
  ClientsPersonalInfo.ClientID = PaymentTransaction.ClientID and
  ClientsPersonalInfo.ClientID = Clients.ClientID and
  Clients.GDPR = 'N' and (select datediff(dd,PaymentDate,GETDATE())
                          from PaymentTransaction
                          where
                            ClientsPersonalInfo.ClientID = PaymentTransaction.ClientID)>30

delete from GymCard
from Clients, PaymentTransaction
where 
  GymCard.ClientID = Clients.ClientID and
  GymCard.ClientID = PaymentTransaction.ClientID and
  Clients.GDPR = 'N' and (select datediff(dd,PaymentDate,GETDATE())
                          from PaymentTransaction
                          where
                            GymCard.ClientID = PaymentTransaction.ClientID)>30

If @@rowcount <>1
rollback

else 
Commit