SQL - convert txt to int and calculate (where some values are null)

I've some numbers stored as txt and need to handle nulls while also doing a calculation.

AND CAST(ISNULL(MED_PVAR1_DPD,'0') AS INT) < 3.05

despite my thinking this might work the above gives me :
"Conversion failed when converting the varchar value '3.05' to data type int."
ghettocounselorPharmacy Systems AdminAsked:
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Shaun KlineLead Software EngineerCommented:
My quick guess would be that casting a varchar that contains a decimal point to an integer is not allowed. Have you tried casting it to a decimal?
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ghettocounselorPharmacy Systems AdminAuthor Commented:
AND CAST(ISNULL(MED_PVAR1_DPD,'0') AS DECIMAL) < 3.05

THIS WORKED !
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Query Syntax

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