Thank you all very much.
This "official" forum is really great.
2009/11/19 Oliveiros C,
> Howdy,
>
> It is quite simple, the joins you used would output a long list of
> pairs (client,computer), and, as many people has more than one computer,
> many clients will appear repeated, but the COUNT k
Howdy,
It is quite simple, the joins you used would output a long list of
pairs (client,computer), and, as many people has more than one computer, many
clients will appear repeated, but the COUNT keyword will count them more than
once though.
The DISTINCT keyword prevents one client from appear
