如何在MSSQL 2008中的SELECT語句中編寫IF ELSE？

Question

這是我想要做的：

SELECT iif(d.ItemType = 'INVOICE', 0, iif(d.ItemType = 'PACKING', 0, 1)) AS MissingDocuments FROM dbo.DocumentDetails AS D

不幸的是意識到這與MSSQL2008不兼容。 所以嘗試編寫IF ELSE但也沒有用。

SELECT  IF d.ItemType = 'INVOICE'
   0
ELSE 
   BEGIN
      d.ItemType = 'PACKING'
      0
   ELSE
      1
   END  AS MissingDocuments
FROM  dbo.DocumentDetails AS D 

你能告訴我在這里做錯了什么嗎？

Answer 1

使用CASE ... WHEN 。 最簡潔的邏輯似乎是：

SELECT 
  CASE WHEN d.ItemType IN ('INVOICE', 'PACKING') THEN 0 ELSE 1 END
     AS MissingDocuments 
FROM dbo.DocumentDetails AS d

即如果文件不是“發票”或“包裝”，則文件丟失

Answer 2

我想你Case When嘗試這個Case When尋找Case When ..

SELECT 
 case when d.ItemType = 'INVOICE' or d.ItemType = 'PACKING'
 then  0
 ELSE
  1
 END  AS MissingDocuments
FROM  dbo.DocumentDetails AS D