子查询中的SQL Select

debugcn 发表于 Dev

达里尔

嗨，我的查询如下，并在其中包含一个子查询：

ALTER PROCEDURE [dbo].[POBalance] @PONumber NVARCHAR(50) 
AS
BEGIN
    SELECT CASE 
            WHEN X.STATUS = 'False'
                THEN (  SELECT A.Description
                            ,C.qty AS POqty
                            ,B.Qty AS PDQty
                            ,CASE 
                                WHEN A.partialflag = 'false'
                                    THEN '0'
                                ELSE A.qty
                                END AS Balance
                            ,A.Unit
                            ,A.Unitprice
                            ,A.Partialflag
                        FROM tblPOdetails AS A
                        INNER JOIN tblPDdetails AS B ON A.id = B.id
                        INNER JOIN tblpodetailshistory AS C ON A.id = C.id
                        WHERE A.PONo = @PONumber
                        )
            ELSE (  SELECT A.Description
                        ,C.qty AS POqty
                        ,B.Qty AS PDQty
                        ,C.qty AS Balance
                        ,A.Unit
                        ,A.Unitprice
                        ,A.Partialflag
                    FROM tblPOdetails AS A
                    INNER JOIN tblPDdetails AS B ON A.id = B.id
                    INNER JOIN tblpodetailshistory AS C ON A.id = C.id
                    WHERE A.PONo = @PONumber)
            END
    FROM tblPOHeader AS X
    WHERE x.PONo = @PONumber
END

我得到的错误是：

如果未使用EXISTS引入子查询，则只能在选择列表中指定一个表达式。

我的查询有什么问题..看来我的子查询还可以。

提前致谢

拉杜·格奥尔基（Radu Gheorghiu）

您真的在寻找这个吗？

ALTER PROCEDURE [dbo].[POBalance] @PONumber NVARCHAR(50)
AS
BEGIN
    DECLARE @Status NVARCHAR(MAX)

    SELECT @Status = X.STATUS
    FROM tblPOHeader AS X WHEREx.PONo = @PONumber

    IF @Status = 'False'
    BEGIN
        SELECT A.Description
            ,C.qty AS POqty
            ,B.Qty AS PDQty
            ,CASE 
                WHEN A.partialflag = 'false'
                    THEN '0'
                ELSE A.qty
                END AS Balance
            ,A.Unit
            ,A.Unitprice
            ,A.Partialflag
        FROM tblPOdetails AS A
        INNER JOIN tblPDdetails AS B ON A.id = B.id
        INNER JOIN tblpodetailshistory AS C ON A.id = C.id
        WHERE A.PONo = @PONumber
    END
    ELSE
    BEGIN
        SELECT A.Description
            ,C.qty AS POqty
            ,B.Qty AS PDQty
            ,C.qty AS Balance
            ,A.Unit
            ,A.Unitprice
            ,A.Partialflag
        FROM tblPOdetails AS A
        INNER JOIN tblPDdetails AS B ON A.id = B.id
        INNER JOIN tblpodetailshistory AS C ON A.id = C.id
        WHERE A.PONo = @PONumber
    END
END

这段代码将存储然后检查和的值，@Status并基于该值是否False等于0来返回查询之一的结果集。

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