multi-table query error...

[Fabio Vaona]

Hi All!
This is a strange problem... I don't know how to solve it.
I usually write PHP/mysql code on my localhost machine then upload on the server the scripts.

This run on my local machine, but give me an error on the server...

Could someone check it?

$nnn =
mysql_num_rows(
mysql_query(
"select qid from db_qw_db
where active='1'
and internalstatus='1'
and status='0'
and EXISTS (
select qsaid from db_qw_site_addr
where db_qw_site_addr.address like '%".$province_ricerca[$prov]."%'
and db_qw_site_addr.qid = db_qw_db.qid )
"));

This run with no problem on my localhost machine, but, on the server return the classic "Warning: mysql_num_rows(): supplied argument is not a valid MySQL...."

please, help!
regards
Fabio