Question

我的存储过程中有以下查询

DECLARE @I INT
DECLARE @TenPercent int
DECLARE @RowsCount int

SET @TenPercent =10
SET @I = 1

SELECT 
    @I, dbo.tblVegetationType.VegTypeCode, dbo.tblVegetationType.VegTypeName
FROM 
    dbo.tblVegetationType 
INNER JOIN 
    dbo.tblVegTypeVegFormationLink ON dbo.tblVegetationType.VegTypeID = dbo.tblVegTypeVegFormationLink.VegTypeID
INNER JOIN 
    tblCMAVegTypeLink ON dbo.tblVegetationType.VegTypeID = dbo.tblCMAVegTypeLink.VegTypeID
WHERE   
    dbo.tblVegetationType.PercentageCleared >= (@PercentCleared - @TenPercent)
    AND dbo.tblVegTypeVegFormationLink.VegetationFormationID = @VegetationFormationID
    AND dbo.tblCMAVegTypeLink.CMAID = @CMAID

我有以下条件

dbo.tblVegetationType.PercentageCleared >= (@PercentCleared - @TenPercent)

我在这里要做的是：如果PercentCleared为60％，那么我想查询从50％中选择列表。

所以我只需添加SET @TenPercent = 10并从条件中减去。

这是一种正确的方法吗？

Answer 1

编写查询的另一种方法可以是：

SELECT @I,
       VT.VegTypeCode,
       VT.VegTypeName
FROM dbo.tblVegetationType VT
INNER JOIN dbo.tblVegTypeVegFormationLink VTVF
ON VT.VegTypeID = VTVF.VegTypeID
INNER JOIN tblCMAVegTypeLink CVT
ON VT.VegTypeID = CVT.VegTypeID
WHERE 1= case when  @PercentCleared >= 60 and  VT.PercentageCleared <= 50 then 1
-- you can add condition when @PercentCleared < 60 then what values of   
-- VT.PercentageCleared are to be considered
        when  @PercentCleared < 60 and  VT.PercentageCleared <= 50 then 1
        end
AND VTVF.VegetationFormationID = @VegetationFormationID
AND CVT.CMAID = @CMAID

在存储过程中减去的正确方法

1 个答案: