如何在条件第二次查询中使用第一个查询的结果？

Question

我必须选择两个表数据，一个是PackageData，另一个是PackageDataDetails。这里的PackageData是Parent表，PackageDataDetails是子表。

见下面的代码：

SELECT 
    PD.Id, PD.MemberId, PD.Merchant, PD.Weight, PD.Remarks
FROM 
    [dbo].[PackageData] PD
INNER JOIN 
    Account A ON A.MemberId = PD.MemberId
INNER JOIN 
    Users U ON U.Id = A.UserId AND (@UserId IS NULL OR U.Id = @UserId)
WHERE 
    (@Status IS NULL OR @Status = '' OR  PD.SystemStatus = @Status)
    AND (@Id IS NULL OR PD.Id = @Id)
ORDER BY 
    MD.Id
    OFFSET @PageSize * (@PageNo+1 - 1) ROWS  
    FETCH NEXT @PageSize ROWS ONLY 
OPTION (RECOMPILE);

SELECT 
    PDD.Id, PDD.PackageDataId, PDD.Description, PDD.Quantity, PDD.Status
FROM 
    [dbo].[PackageDataDetails] PDD
INNER JOIN 
    [dbo].[PackageData] PD ON PD.Id = PDD.PackageDataId
WHERE 
    PDD.PackageDataId IN ({PD.Id of Above Select query})

此代码块是在存储过程中编写的。在这里，我不想重写第二个查询条件的第一个查询。

我必须在一个API响应中使用此存储过程才能在一个DB调用中执行操作。请分享您的想法以解决此问题。

Answer 1

您可以在表变量中插入第一个查询数据，然后在第二个查询中从表变量中获取id。如下所示。

码：

 Declare @tblData TABLE
    ( 
        Id          Int,
        MemberId                    Int,
        Merchant    NVARCHAR(Max),
        Weight  NVARCHAR(Max),
        Remarks               Nvarchar(Max)

    );

   Insert Into @tblData
(
    Id,
    MemberId,
    Merchant,
    Weight,
    Remarks
)

SELECT PD.Id ,PD.MemberId, PD.Merchant,PD.Weight,PD.Remarks
FROM [dbo].[PackageData] PD
INNER JOIN Account A ON A.MemberId = PD.MemberId
INNER JOIN Users U ON U.Id = A.UserId AND (@UserId IS NULL OR U.Id = @UserId)
WHERE (@Status IS NULL OR @Status = '' OR  PD.SystemStatus = @Status)
AND (@Id IS NULL OR PD.Id = @Id)
ORDER BY MD.Id
OFFSET @PageSize * (@PageNo+1 - 1) ROWS  FETCH NEXT @PageSize ROWS ONLY OPTION (RECOMPILE);

SELECT PDD.Id, PDD.PackageDataId, PDD.Description, PDD.Quantity, PDD.Status
FROM [dbo].[PackageDataDetails] PDD
INNER JOIN [dbo].[PackageData] PD ON PD.Id = PDD.PackageDataId
WHERE PDD.PackageDataId IN (select Id from @tblData )

Answer 2

请尝试以下查询。

第一次查询

SELECT 
    PD.Id ,PD.MemberId, PD.Merchant,PD.Weight,PD.Remarks
    INTO #temp 
    FROM [dbo].[PackageData] PD
    INNER JOIN Account A ON A.MemberId = PD.MemberId
    INNER JOIN Users U ON U.Id = A.UserId AND (@UserId IS NULL OR U.Id = @UserId)
    WHERE (@Status IS NULL OR @Status = '' OR  PD.SystemStatus = @Status)
    AND (@Id IS NULL OR PD.Id = @Id)
    ORDER BY MD.Id
    OFFSET @PageSize * (@PageNo+1 - 1) ROWS  FETCH NEXT @PageSize ROWS ONLY OPTION (RECOMPILE);

获取输出第一个查询

 SELECT * FROM #temp 

第二个查询与第一个查询结果。

SELECT 
     PDD.Id, PDD.PackageDataId, PDD.Description, PDD.Quantity, PDD.Status
FROM [dbo].[PackageDataDetails] PDD
    INNER JOIN [dbo].[PackageData] PD ON PD.Id = PDD.PackageDataId
    WHERE PDD.PackageDataId IN (SELECT PD.Id FROM #temp)

DROP TABLE #temp

Answer 3

使用CTE（公用表表达式）：

即：

    ;with CTE1 as (
 select 1 as Col1,
 2 as Col2,
 3 as Col3
), CTE2 as (
select 1 as Col1,
        5 as Col2,
        6 as Col3
)select * from CTE1 where CTE1.Col1 IN (select Col1 from CTE2)

Answer 4

如果您只需要第一个查询来提供第二个查询，请在CTE中包装第一个查询并参考运行第二个查询：

;WITH PackageDataFiltered AS
(
    SELECT PD.Id ,PD.MemberId, PD.Merchant,PD.Weight,PD.Remarks
    FROM [dbo].[PackageData] PD
    INNER JOIN Account A ON A.MemberId = PD.MemberId
    INNER JOIN Users U ON U.Id = A.UserId AND (@UserId IS NULL OR U.Id = @UserId)
    WHERE (@Status IS NULL OR @Status = '' OR  PD.SystemStatus = @Status)
    AND (@Id IS NULL OR PD.Id = @Id)
    ORDER BY MD.Id
    OFFSET @PageSize * (@PageNo+1 - 1) ROWS  FETCH NEXT @PageSize ROWS ONLY 
)
SELECT PDD.Id, PDD.PackageDataId, PDD.Description, PDD.Quantity, PDD.Status
-- You can refer to fields from the CTE here too
-- like select the PDF.Merchant or PDF.Remarks
FROM [dbo].[PackageDataDetails] PDD
INNER JOIN [dbo].[PackageData] PD ON PD.Id = PDD.PackageDataId
INNER JOIN PackageDataFiltered PDF ON PDF.Id = PDD.PackageDataId