Sql server 如何更改存储过程中SELECT返回的值？

我的存储过程返回以下内容：

    DECLARE @AnswerGridCorrect VARCHAR(20)
    ...
    ...
    SELECT  @AnswerGridResponses AS AnswerGridResponses,
            @AnswerGridCorrect AS AnswerGridCorrect,
            @Authenticated As Authenticated,
            @RC AS RC,
            @Result AS Result

如果

@Result='F'

，我如何使它为

@AnswerGridCorrect

返回

NULL

您可以使用switch case语句来实现这一点

样品 更多信息

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谢谢。我也可以用你的方式先对这段代码做案例陈述吗？设置@Authenticated=（当@ROWCOUNT>0时选择CASE，然后选择1，否则0结束）

DECLARE @AnswerGridCorrect VARCHAR(20)
...
...
SELECT  @AnswerGridResponses AS AnswerGridResponses,
        CASE @Result
           WHEN 'F' THEN null
           ELSE @AnswerGridCorrect 
        END AS AnswerGridCorrect,
        @Authenticated As Authenticated,
        @RC AS RC,
        @Result AS Result