+ if ( $params->{'exportnum'} =~ /^(\d+)$/ ) {
+ push @from, ' LEFT JOIN export_svc USING ( svcpart )';
+ push @where, "exportnum = $1";
+ }
+
+ # sector and tower
+ my @where_sector = $class->tower_sector_sql($params);
+ if ( @where_sector ) {
+ push @where, @where_sector;
+ push @from, ' LEFT JOIN tower_sector USING ( sectornum )';
+ }