I'd look to exceptional cases as the problem since the logic looks ok (especially with the added parens).

What happens if there are no rows returned?

What happens if a DBI error occurs?

I'll try to take more detailed look later, but it's been my experience that DBI can throw you some curves that are less than obvious.

In reply to Re: Re: Re: Boolean operators and list assignments by jreades
in thread Boolean operators and list assignments by flymolo

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