Question

我试图做一个包含CASE语句的WHERE子句。如果我的字段等于某个文本值，那么我想应用一组逻辑，如果它包含一个单独的值，那么我希望它以不同的方式过滤。

我有这段代码，但我无法使其正常工作：

    AND CASE DO11_DOCUM_MG36 WHEN 'TSC-ORDINE-RIC'
                                               THEN 
                                               (CONVERT(DATE,ISNULL(dbo.DO31_DOCCORPOORD.DO31_DATACONS,DATEADD(day,ISNULL(dbo.DO17_DOCTESTAPERS.DO17_NUMPERS4,15),dbo.DO12_DOCTESTARIF.DO12_DATAVSCONF)),102) <= '2016-02-29' AND dbo.DO12_DOCTESTARIF.DO12_DATAVSCONF is not null) AND (dbo.DO36_DOCCORPOEST.DO36_DATAST1 is null or CONVERT(DATE,dbo.DO36_DOCCORPOEST.DO36_DATAST1,102) >= '2016-02-01')
                                               ELSE
                                               (CONVERT(DATE,ISNULL(dbo.DO31_DOCCORPOORD.DO31_DATACONS,DATEADD(day,ISNULL(dbo.DO17_DOCTESTAPERS.DO17_NUMPERS4,15),dbo.DO12_DOCTESTARIF.DO12_DATAVSCONF)),102) BETWEEN '2016-02-01' AND '2016-02-29' AND dbo.DO12_DOCTESTARIF.DO12_DATAVSCONF is not null) 
                                               END

由于

Answer 1

我的格式不同，以便于阅读。 CASE语句的逻辑应该是CASE WHEN ......那么...... ELSE ... END。你可以在WHEN语句中加入AND子句，但我不知道你可以像你一样在你的THEN子句中使用AND。

你的WHEN语句不会产生一个boolian值，没有'WHEN x = y THEN'只有'WHEN x THEN'。

在陈述开头的CASE和WHEN之间也应该没有任何内容，这永远不会起作用。

请同时开始使用表别名，它将使您的代码更容易阅读。

AND CASE DO11_DOCUM_MG36
        WHEN 'TSC-ORDINE-RIC'
            THEN (
                    CONVERT(DATE, ISNULL(dbo.DO31_DOCCORPOORD.DO31_DATACONS, DATEADD(day, ISNULL(dbo.DO17_DOCTESTAPERS.DO17_NUMPERS4, 15), dbo.DO12_DOCTESTARIF.DO12_DATAVSCONF)), 102) <= '2016-02-29'
                    AND dbo.DO12_DOCTESTARIF.DO12_DATAVSCONF IS NOT NULL
                    )
                AND (
                    dbo.DO36_DOCCORPOEST.DO36_DATAST1 IS NULL
                    OR CONVERT(DATE, dbo.DO36_DOCCORPOEST.DO36_DATAST1, 102) >= '2016-02-01'
                    )
        ELSE (
                CONVERT(DATE, ISNULL(dbo.DO31_DOCCORPOORD.DO31_DATACONS, DATEADD(day, ISNULL(dbo.DO17_DOCTESTAPERS.DO17_NUMPERS4, 15), dbo.DO12_DOCTESTARIF.DO12_DATAVSCONF)), 102) BETWEEN '2016-02-01'
                    AND '2016-02-29'
                AND dbo.DO12_DOCTESTARIF.DO12_DATAVSCONF IS NOT NULL
                )
        END

CASE语句逻辑应该是这样的;

CASE
    WHEN a.Field1 = 'SomeText'
        THEN CONVERT(DATE, a.DateTimeField)
    WHEN a.Field1 = 'DifferentText' AND a.Field2 = 'YetMoreText'
        THEN CONVERT(DATE, a.DifferentDateTimeField)
    ELSE 'DoSomethingElse'
END

进一步阅读;

http://www.techonthenet.com/sql_server/functions/case.php

阅读你的逻辑，我不相信你在这里需要一个案例陈述，像你这样的事情;

AND
    (
        CONVERT(DATE, ISNULL(dbo.DO31_DOCCORPOORD.DO31_DATACONS, DATEADD(day, ISNULL(dbo.DO17_DOCTESTAPERS.DO17_NUMPERS4, 15), dbo.DO12_DOCTESTARIF.DO12_DATAVSCONF)), 102) <= '2016-02-29'
        AND dbo.DO12_DOCTESTARIF.DO12_DATAVSCONF IS NOT NULL
    )
AND
    (         
        (
        dbo.DO36_DOCCORPOEST.DO36_DATAST1 IS NULL
        OR CONVERT(DATE, dbo.DO36_DOCCORPOEST.DO36_DATAST1, 102) >= '2016-02-01'
        )
        OR          
        CONVERT(DATE, ISNULL(dbo.DO31_DOCCORPOORD.DO31_DATACONS, DATEADD(day, ISNULL(dbo.DO17_DOCTESTAPERS.DO17_NUMPERS4, 15), dbo.DO12_DOCTESTARIF.DO12_DATAVSCONF)), 102) BETWEEN '2016-02-01'AND '2016-02-29'
    )

根据你的评论，你可以使用它;

AND (
        (   OrderType = 'TSC-ORDINI-RIC'
            AND
            'WHERE CONDITION 1 GOES HERE'
        )
        OR 
        (   OrderType = 'TSC-ORDINI'
            AND
            'WHERE CONDITION 2 GOES HERE'
        )
    )

WHERE子句中的SQL CASE语句

1 个答案: