Question

我有一份报告，显示由缩进创建的一段时间内的购买缩进。这里，@ Name参数用于过滤缩进。但是，问题是，如果@Name参数为空，则报告返回空记录。如果@Name过滤器中未选择任何内容，我想显示所有缩进的报告。以下是查询。我是SQL的新手。

SELECT INH.No_, INH.[Approved Date],  
INH.Indentor, INL.No_ AS ItemCode, 
INL.Description, INL.Description2, 
INL.Req_Quantity, INL.[Unit of Measure], 
PL.[Document No_], PH.[Order Date], PL.Quantity AS OrderedQuantity, PL.[Quantity Received]
FROM [Company$Indent Header] AS INH
INNER JOIN
[Company$Indent Line] AS INL
ON INH.No_ = INL.[Document No_]
INNER JOIN
[Company$Purchase Line] AS PL
ON INL.[Document No_] = PL.[Indent No_] AND INL.[Line No_] = PL.[Indent Line No_]
INNER JOIN
[Company$Purchase Header] AS PH 
ON PL.[Document No_] = PH.No_
WHERE (INH.Indentor = @Name) AND (INL.No_ <> '') AND 
(INH.[Approved Date] BETWEEN @StartDate AND @EndDate)
ORDER BY ItemCode

Answer 1

您的查询是如何构建的。通过代码？因为如果@Name为空，我只会从下面的(INH.Indentor = @Name)中省略WHERE (INH.Indentor = @Name) AND。我想SQL中没有条件是否要考虑WHERE clausule中的条件，如果我错了，请纠正我。

Answer 2

使用像这样的东西

WHERE (INH.Indentor = COALESCE(@Name,INH.Indentor)

并确保在参数检查后的存储过程开始时

if len(@Name) = 0
set @Name = null

这样如果@Name为空，则会将null设置为null COALESCE（@ Name，INH.Indentor）将检查@Name是否为null，然后检查现有值

Answer 3

试试这个 -

SELECT
      INH.No_
    , INH.[Approved Date]
    , INH.Indentor
    , ItemCode = INL.No_ 
    , INL.[description]
    , INL.Description2
    , INL.Req_Quantity
    , INL.[Unit of Measure]
    , PL.[Document No_]
    , PH.[Order Date]
    , OrderedQuantity = PL.Quantity 
    , PL.[Quantity Received]
FROM dbo.[Company$Indent Header] INH
JOIN dbo.[Company$Indent Line] INL ON INH.No_ = INL.[Document No_]
JOIN dbo.[Company$Purchase Line] PL ON INL.[Document No_] = PL.[Indent No_] AND INL.[Line No_] = PL.[Indent Line No_]
JOIN dbo.[Company$Purchase Header] PH ON PL.[Document No_] = PH.No_
WHERE INH.Indentor = ISNULL(@Name, INH.Indentor)
    AND INL.No_ != ''
    AND INH.[Approved Date] BETWEEN @StartDate AND @EndDate
ORDER BY ItemCode

如果Filter为NULL（空），如何返回所有记录

3 个答案: