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Asked: 2026-05-27T16:53:19+00:00

Ok, the title is probably confusing. I need to use a case statement to

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Ok, the title is probably confusing.

I need to use a case statement to calculate the amount of tax to deduct offa value.

This reduced value will be used in a Scalar function to calculate another value in a CTE in a Stored procedure..

How can I re-use this calculated column inside the scalar function?? I have tried the following. 

paidminusIPT = case when country = "ireland" then (paid - 1) else paid end,
dbo.fnEarnedPrem(a,b,c,d,paidminusipt,e,f)

please note, this isn’t the exact code, just a quick reference..

Is this possible to do?

Regards.

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1 Answer

  1. Editorial Team

    You should use full expression instead of just column name:

    paidminusIPT = case when country = "ireland" then (paid - 1) else paid end,
dbo.fnEarnedPrem(a,b,c,d,case when country = "ireland" then (paid - 1) else paid end,e,f)

    or use CTE

    ;WITH C as(
SELECT a,b,c,d,e,f,paidminusIPT = case when country = "ireland" then (paid - 1) else paid end FROM SomeTable)
Select *,dbo.fnEarnedPrem(a,b,c,d,paidminusipt,e,f) FROM C
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