I heard from a coworker recently that when using SQL with an ORDER BY via DBI, you are not guaranteed to get your results back in the order you specified in your SQL. I've never heard of such a thing, the DBI perldocs specifically use SQL with an ORDER BY as an example, and I've never had problems using ORDER BY in any of my programs over the years.

Did I maybe just hear what he was saying wrong? Does anybody know of any caveats using ORDER BY in SQL with DBI?