方案一、使用 CASE 关键字

SELECT CAST( CASE WHEN Obsolete = 'N' or InStock = 'Y' THEN 1 ELSE 0 END AS bit) as Saleable, * FROM Product 

以上语句返回的是一个布尔值，如何需要返回 int 类型呢，如下：

SELECT CASE WHEN Obsolete = 'N' or InStock = 'Y' THEN 1 ELSE 0 END as Saleable, * FROM Product 

方案二、使用 IIF 关键字

由于IIF 关键字是SQL Server 2012及上以版本才有的，所以本方案仅适合SQL Server 2012及以上版本，代码如下：

SELECT IIF(Obsolete = 'N' or InStock = 'Y', 1, 0) as Saleable, * FROM Product 

方案三

SELECT (CASE WHEN (Obsolete = 'N' OR InStock = 'Y') THEN 'YES' ELSE 'NO' END) as Salable , * FROM Product 

方案四

IF EXISTS(SELECT * FROM Northwind.dbo.Customers WHERE CustomerId = 'ALFKI') PRINT 'Need to update Customer Record ALFKI' ELSE PRINT 'Need to add Customer Record ALFKI' IF EXISTS(SELECT * FROM Northwind.dbo.Customers WHERE CustomerId = 'LARSE') PRINT 'Need to update Customer Record LARSE' ELSE PRINT 'Need to add Customer Record LARSE' 

方案六

DECLARE @Product TABLE ( id INT PRIMARY KEY IDENTITY NOT NULL ,Obsolote CHAR(1) ,Instock CHAR(1) ) INSERT INTO @Product ([Obsolote], [Instock]) VALUES ('N', 'N'), ('N', 'Y'), ('Y', 'Y'), ('Y', 'N') ; WITH cte AS ( SELECT 'CheckIfInstock' = CAST(ISNULL(NULLIF(ISNULL(NULLIF(p.[Instock], 'Y'), 1), 'N'), 0) AS BIT) ,'CheckIfObsolote' = CAST(ISNULL(NULLIF(ISNULL(NULLIF(p.[Obsolote], 'N'), 0), 'Y'), 1) AS BIT) ,* FROM @Product AS p ) SELECT 'Salable' = c.[CheckIfInstock] & ~c.[CheckIfObsolote] ,* FROM [cte] c 

方案七

SELECT 1 AS Saleable, * FROM @Product WHERE ( Obsolete = 'N' OR InStock = 'Y' ) UNION SELECT 0 AS Saleable, * FROM @Product WHERE NOT ( Obsolete = 'N' OR InStock = 'Y' )