"Darren New" <dne### [at] sanrrcom> wrote in message
news:480d2b39$1@news.povray.org...

> The "group by" lets you select on anything. (I.e., the "where" clause
> can refer to any column, including joins with other tables etc.)  But
> everything you *return* has to either be mentioned in the "group by"
> clause or has to be a summary function (like count(), sum(), avg(),
> etc).  (I forget what those kinds of functions are called in SQL, but...)

Aggregate.

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