You're trying to populate $columns before you've even populated $row out of the DB. You need to do this within the while() loop (perhaps with a count variable so that it only runs on the first pass). Also, you declare $queryResult, but then later use it in a very strange way.

What is your goal for $queryResult? Is it to add the headers, then append details from every row?

In reply to Re: DBI::CSV using a variable to request columns by stevieb
in thread DBI::CSV using a variable to request columns by Sandy_Bio_Perl

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