JP,
> Apologies Josh... I'm so dumb. I overlooked the Functions and
> Opterators chapter (it's taking me a little time to assimilate the
> structure of online documentation). Thanks for your patience and
> explanations.
Well, the online docs are a reference, not a learning tool. I heartily
reccommend that you get a PostgreSQL book, it'll save you a *lot* of
time asking questions of the list.
-Josh