Question

SELECT  
    dbo.Customers.FirstName as Firstname, dbo.Customers.LastName as Lastname, 
    dbo.Customers.Phone as Phone,  dbo.Guarantors.FirstName as Guarantor Firstname, 
    dbo.Guarantors.LastName as Guarantor Lastname, 
    dbo.Guarantors.Phone as Guarantor Phone, 
    SUM(dbo.PaymentHistory.PaymentAmount) - SUM(dbo.PaymentHistory.PayedAmount) as Debt
FROM    
    dbo.Credits 
INNER JOIN
    dbo.PaymentHistory ON dbo.Credits.ID = dbo.PaymentHistory.CreditID 
INNER JOIN
    dbo.Customers ON dbo.Credits.CustomerID = dbo.Customers.ID 
LEFT OUTER JOIN
    dbo.CreditGuarantors ON dbo.Credits.ID = dbo.CreditGuarantors.CreditID 
LEFT OUTER JOIN
    dbo.Guarantors ON dbo.CreditGuarantors.GuarantorID = dbo.Guarantors.ID
WHERE   
    (dbo.Credits.Status = 0) AND 
    (dbo.PaymentHistory.PaymentDay <= GETDATE()) AND 
    (dbo.Credits.BranchID = 1)
GROUP BY 
    dbo.Customers.LastName, dbo.Customers.Phone,
    dbo.Credits.ID, dbo.Customers.FirstName, 
    dbo.Guarantors.FirstName, dbo.Guarantors.LastName, 
    dbo.Guarantors.Phone

所以我想再添加一条规则where Debt !=0。但我得到了错误，你可以帮我吗？我想得到不是0的债务，有债务的人姓

Answer 1

使用HAVING子句。将其添加到查询的末尾：

HAVING SUM(dbo.PaymentHistory.PaymentAmount) - SUM(dbo.PaymentHistory.PayedAmount) <> 0

Answer 2

因为这涉及聚合函数，所以您希望使用HAVING子句：

HAVING SUM(dbo.PaymentHistory.PaymentAmount) - SUM(dbo.PaymentHistory.PayedAmount) <> 0

或者：

HAVING SUM(dbo.PaymentHistory.PaymentAmount) <> - SUM(dbo.PaymentHistory.PayedAmount)

注意：如果您使用表别名，您的查询将更容易编写和读取。

如何根据自定义列进行选择

2 个答案: