Case statement returning "Bad character in format or data...." - response (5) by Qaisar Aftab Kiani

You will always get an error if you you are casting a character data into numeric INTEGER/DECIMAL. You should check whether the content is numeric is or not before casting it. I guess your UDF udf_isnumeric() is the one that can handle this scenario when i_pdt_gl in('12984','22984') then CASE WHEN udf_isnumeric(clm.C_POL) = 1 THEN trim(cast(cast(clm.C_POL as decimal (10,0) format '9999999999') as char(10))) ELSE 'BAD DATA' END I am guessing that the UDF udf_isnumeric that youa re using in your CASE statement is for the same purpose...