T-SQL语法问题 - 在CASE语句中使用OR

Question

我想构建一个包含以下逻辑的CASE语句，但是sql编译器不喜欢我的语句中的'OR'：

CASE expression
WHEN expression1 OR expression2
THEN <yadda yadda>
ELSE <yadda yadda>
END

更具体的代码如下：

CASE @var1
WHEN '99' OR '22'   
            THEN        
                (CASE @var2
                WHEN 'All' THEN col1
                ELSE @var2
                END)
END

Answer 1

DECLARE @Variable INT;
SET @Variable = 1;

SELECT
    CASE
        WHEN @Variable = 1 OR @Variable = 2 THEN 'It is 1 or 2'
        WHEN @Variable = 3 THEN 'It is 3'
        ELSE 'It is not 1, 2, or 3'
    END AS [SomeField]

MSDN docs for CASE，OR和Expressions。

Answer 2

根据您的编辑，您甚至不需要OR声明：

CASE 
    WHEN @var1 IN ('99', '22')                
    THEN                         
         (CASE @var2                 
          WHEN 'All' 
          THEN col1                 
          ELSE @var2                 
          END) 
    END