我有一个用户表和一个付款表。 我需要一个问题单,列出在外勤付款Completed=1的支付表中有记录的用户。
这些是表格中的栏目(简化):
Users: UserID, UserName
Payments: PaymentID, UserID, PaymentCompleted
询问应当选择外地用户名称。
我有一个用户表和一个付款表。 我需要一个问题单,列出在外勤付款Completed=1的支付表中有记录的用户。
这些是表格中的栏目(简化):
Users: UserID, UserName
Payments: PaymentID, UserID, PaymentCompleted
询问应当选择外地用户名称。
select distinct UserName
from Users left outer join Payments on Users.UserID = Payments.UserID
where PaymentCompleted is NULL or PaymentCompleted != 1
SELECT UserName
FROM Users u
WHERE NOT EXISTS(Select 1
from Payments p
Where p.UserId = u.UserId
AND p.PaymentCompleted = 1)
* 选自t_user T. 不存在T.userid的地方(见p.userid from t_ Remunerations t where PayCompleted=1)。
一项说明:对于大量记录来说,“不在”条款的计算效率低。 如果你开始看到业绩问题,你可能会想做一些令人振奋/重新设计的工作。
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