Question

我有一个这样的存储过程（缩短到必要的最小值）：

CREATE PROCEDURE [dbo].[proc_Foo]
    -- Add the parameters for the stored procedure here
    @StyleNumber int,
    @App nvarchar(50),
    @User nvarchar(20)
AS
BEGIN
    DECLARE @UserChar varchar(1) = 'U'

    -- User with App
    SELECT [StyleType],
           [Value], 'UA' AS 'DerivedFrom'
    FROM daten.dbo.GridStyleLocal
    WHERE [StyleAssign] = @UserChar
    AND [User] = @User
    AND [StyleNumber] = @StyleNumber
    AND [Application] = @App

    UNION

    -- Global (Basis) with app
    SELECT [StyleType],
           [Value], 'GA' AS 'DerivedFrom'
    FROM basis.dbo.GridStyle
    WHERE [StyleNumber] = @StyleNumber
    AND [Application] = @App
    AND [StyleType] NOT IN (
        SELECT [StyleType]
        FROM daten.dbo.GridStyleLocal
        WHERE [StyleAssign] = @UserChar
        AND [User] = @User
        AND [StyleNumber] = @StyleNumber
        AND [Application] = @App)

    UNION

    -- Scrape missing StyleTypes from Number 0
    SELECT [StyleType],
           [Value], 'G0A' AS 'DerivedFrom'
    FROM basis.dbo.GridStyle
    WHERE [StyleNumber] = 0
    AND [Application] = @App
    AND [StyleType] NOT IN (
        SELECT [StyleType]
        FROM daten.dbo.GridStyleLocal
        WHERE [StyleAssign] = @UserChar
        AND [User] = @User
        AND [StyleNumber] = @StyleNumber
        AND [Application] = @App)
    AND [StyleType] NOT IN (
        SELECT [StyleType]
        FROM basis.dbo.GridStyle
        WHERE [StyleNumber] = @StyleNumber
        AND [Application] = @App)

END

GO

现在StyleNumber 0是我的基本风格。不在另一个StyleType中的所有属性（StyleNumber）都是从StyleNumber 0派生的。但现在，如果我在应用中包含第二个SELECT（全局（基础）） @StyleNumber设置为0，DerivedFrom值为GA而不是G0A。

那么有没有任何条件，如果SELECT为0，可以将@StyleNumber排除在联合之外？

Answer 1

不太清楚你需要什么。假设您需要从第二个查询获得G0A @StyleNumber = 0，请使用{更改您的second select query （ - 全球（基础）与应用） {1}}。

CASE

如果SELECT [StyleType], [Value], CASE @StyleNumber WHEN 0 THEN 'G0A' ELSE 'GA' END AS 'DerivedFrom' FROM basis.dbo.GridStyle --Rest fo the query，请不要从第二个选择查询中选择任何记录，将@StyleNumber = 0添加到CASE;

WHERE clause

SQL Server：有条件地在存储过程中排除Union的一部分

1 个答案: