shahgols (11/14/2012)
Hi all,I have the pleasure of inheriting a select statement that has multiple subqueries and unions in subqueries, and all sorts of logic to the tune of 400 lines. It is throwing a conversion error and I'm having a hard time pinpointing where it is coming from. How would you guys debug a single, huge select statement like this? I can't put breakpoints in various parts since it's just one select statement. There are no variables involved, so the Locals window is useless as well.
Also, I am not a developer or programmer, so I have limited exposure to the Debug functions in SQL Server. Which is why I need help from those that are pros at this. Thanks in advance!
Start by figuring out what type of conversion error you are getting. The datatype mentioned in the error will give you a starting point. Then remove anything in the where clause. If the query runs at that point you at least know the issue is in the where clause. Look at the datatypes of the columns being joined and identify anywhere the underlying columns do not have matching datatypes. With the complete lack of details that is about the best advice I can offer.
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