A family of Microsoft relational database management and analysis systems for e-commerce, line-of-business, and data warehousing solutions.
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Below is query,
SELECT sum(isnull(Convert( float,Rec.Sell_Amt ),0))-sum(isnull(convert(float ,Pr.Rec_Amt ),0))as Amt,Pr.Level_Four_ID FROM tbl_Receivable_Customer AS Rec left outer join tbl_Received_Amount Pr on Pr.Sell_ID=Rec.Sell_ID where rec.Sell_Del is null and pr.Sell_Del is null group by pr.Level_Four_ID
What is the error (number and message)?
We don't have access to your table definitions and data, so we cannot replicate the issue.
My guess is that the varchar column container other than numeric data.
You can find them by using
WHERE TRY_CAST([yourVarcharCol] as float) IS NULL