[postgis-users] query example??

[AGT]

Hi

I have a lot of points with coordinates in one shapefile and in another
shapefile have a geological map right?; how can I do a query for
instance: how many points are in a geological unit, I use && and ~= but
the result is a box, but I need only the points that are inside one
polygon(a geological unit) what I do??? what's the correct syntax???
help 

regards