Right way to subtract in a stored procedure - sql

Question

I have the following query in my stored procedure
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
I have following condition
dbo.tblVegetationType.PercentageCleared >= (#PercentCleared - #TenPercent)
What I am trying to do here: if PercentCleared is 60% then I want to query to pick the list from 50 %.
So I just add the SET #TenPercent = 10 and subtract from the condition.
Is that a right way to do?

Answer 1

Another way of writing the query can be:
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