您好我的查询如下，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：
当子查询不是时，只能在选择列表中指定一个表达式 与EXISTS一起介绍。
我的查询有什么问题..我的子查询似乎没问题。
提前谢谢
答案 0 :(得分：2)
你不能选择表格以便clausule。你可以这样做（我没有测试过）：
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
INNER JOIN tblPOHeader X ON x.PONo = A.PONo
WHERE A.PONo = @PONumber and X.STATUS = 'False'
UNION ALL
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
INNER JOIN tblPOHeader X ON x.PONo = A.PONo
WHERE A.PONo = @PONumber and X.STATUS <> 'False'
但我觉得X.STATUS有点 - 如果是的话你应该这样做：
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
INNER JOIN tblPOHeader X ON x.PONo = A.PONo
WHERE A.PONo = @PONumber and X.STATUS = 0
UNION ALL
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
INNER JOIN tblPOHeader X ON x.PONo = A.PONo
WHERE A.PONo = @PONumber and X.STATUS <> 0
答案 1 :(得分：1)
你真的在寻找这个吗？
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
此代码将存储然后检查@Status的值，并根据值是否为False，然后它将返回其中一个查询的结果集。
答案 2 :(得分：0)
您无法为一个表达式选择多个字段。您的别名会使其更加明显。您可以选择多个值并仅提供一个别名！ 请参考此
答案 3 :(得分：0)
当
select * from tblPOHeader where PONo = @PONumber
只返回一行，你可以做那样的事情
declare @STATUS nvarchar(200) = ( select STATUS from tblPOHeader where PONo = @PONumber)
if @STATUS = 'False'
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