triggers

Anybody know where I get definitions of triggers (I don't have any text books or doc)? I'm looking in sqlforms under trigger in a form that someone else designed several years ago. I see trigger names like post-query
post-change

pre-insert
pre-update
pre-delete

What do these actually mean? I don't see descriptions in online help.

Thanks,
Martin Meadows Received on Sat Mar 28 1998 - 00:00:00 CST