how to find records in database using select

I need to be able to find certain data as the user has submitted that data twice and delete one record,except that have hundreds of tables and don't know the table where she would have submitted the data, but I have some other key info that I can start with.

My question is,how do i select a record from the database if I don't know the table it comes from?

Could somebody give me an expamle please?How did they submit the data? Do you know the data submitted? You have to have something to go on.|||Can you pose the question exactly as the teacher wrote it in your assignment? Just type it verbatim into a posting, and you'll get a much better quality answer.

-PatP