Question

有两个表Customer和费用(PK customer.CustomerID -> Fees.CustomerId FK) Customer表中有客户。表Fees中没有当前月份的数据。没有在当月的费用表中插入数据我想在客户表中显示客户详细信息，但尚未支付当月费用。

类似的东西：

if(Convert(varchar(3),MonthFee, 109) != convert(varchar(3),getdate(),109))
BEGIN
select Customer.CustomerId as ID, Customer.CustomerName as Name, Customer.Phone as [Phone No], 'UnPaid' as [Pay Status], convert(varchar(3),getdate(),109) as [Month], YEAR(GETDATE()) as [Year]
from Customer inner join Fees on Customer.CustomerId = Fees.CustomerId Where FeeMonth = null

END

感谢帮助，谢谢。

Answer 1

使用以下查询..

 select Customer.CustomerId as ID,  
   Customer.CustomerName as Name, 
   Customer.Phone as   [Phone No],
    'UnPaid' as [Pay Status],   
     convert(varchar(3),getdate(),109) as [Month],   
    YEAR(GETDATE()) as [Year]
  from Customer 
  Where not exists(select 1 from  Fees 
      Where Customer.CustomerId = Fees.CustomerId 
       And    Month( FeeMonth )= month(getdate())
       And year(FeeMonth)=year(getdate())

Answer 2

您需要使用其他类型的联接。最简单的方法是使用右连接，如下所示

select Customer.CustomerId as ID, Customer.CustomerName as Name, Customer.Phone as [Phone No], 'UnPaid' as [Pay Status], convert(varchar(3),getdate(),109) as [Month], YEAR(GETDATE()) as [Year]
from Fees 
right join Customer on Fees.CustomerId = Customer.CustomerId Where FeeMonth = null

SQL - 显示Table1（PK）的数据而没有表2中的数据（FK）

2 个答案: