Question

我正在使用SQL Server，我有两个表：Invoice和InvoiceService。

发票：

InvoiceID      InvoiceDate     InvoicePrice     InvoicePaidAmount  PatientID
----------------------------------------------------------------------------
1               01-01-2016        50                 30              1
2               01-02-2016       100                100              2

InvoiceService ：

ID     InvoiceID     ServiceName     ServicePrice
-------------------------------------------------
1          1         Dermato             20
2          1         ophthalmo           30
3          2         General            100

我的查询：

select 
    ServiceName, ServicePrice, InvoiceID, InvoicePrice,
    InvoicePaidAmount, PatientID   
from 
    InvoiceService
inner join 
    Invoice on Invoice.InvoiceID = InvoiceService.InvoiceID

结果：

ServiceName  ServicePrice InvoiceID  InvoicePrice InvoicePaidAmount PatientID 

Dermato      20            1            50            30               1
ophthalmo    30            1            50            30               1
General      100           2            100           100              2

我需要从左表中获取非重复值：当发票有超过1个服务时，我希望发票价格和InvoicePaidAmount不会像这个例子那样重复：

ServiceName  ServicePrice InvoiceID  InvoicePrice InvoicePaidAmount PatientID 

Dermato      20            1            50            30               1
ophthalmo    30            1            0             0                1
General      100           2            100           100              2

Answer 1

如果我理解正确，您需要一个发票服务，以及＃34;真的＆＃34;比赛。

select s.ServiceName, s.ServicePrice, i.InvoiceID,
       (case when seqnum = 1 then i.InvoicePrice else 0 end) as InvoicePrice,
       (case when seqnum = 1 then i.InvoicePaidAmount else 0 end) as InvoicePaidAmount,
       i.PatientID   
from Invoice i join
     (select s.*,
             row_number() over (partition by s.InvoiceID order by s.id) as seqnum
      from InvoiceService s
     ) s
     on i.InvoiceID = s.InvoiceID

内部联接没有左表的重复值？

1 个答案: