From: "Matt Babineau" <[EMAIL PROTECTED]>
> Got an interesting problem! I have a list of ID's, basically  things
> people have viewed on my website. When I pull the viewable items from my
> database, I need to be able to filter out all the ID's people have
> already viewed, so that they only get a list of things they have not
> viewed.
> I can think of a way to do this, but it is a nasty loop situation, that
> would probably not be good and tie up significant CPU time. Anyone have
> any suggestions on ways to filter view items from a fresh list that I am
> pulling from my Database?

So you have a "thing_id" and a "user_id". How do you mark the user as having
viewed the "thing"?

I'm thinking a LEFT JOIN is in order here, but need some more info on your
table structure.

---John Holmes...

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