Question

Hi I have a stored procedure which suppose to compare between 2 columns on different tables

1. Users.ID => int
2. Trans.ID => nvarchar

Sometimes the value in Trans.ID is not numeric at all, and sometimes it’s null, which causes an error while trying to compare

is there a way to try to parse Trans.ID into a number and in case it doesn’t succeed to return 0??

I tried NullIf() but it doesn’t work when the value inside is not numeric.

Answer 1

you can do something like:

select * from users u 
inner join trans t on u.userid  = (CASE WHEN ISNUMERIC(t.id) = 1 THEN CONVERT(int, t.id) ELSE 0 END)

hope this helps.