#Returns a table's last row number
#input: table name; rownumber
#return: last row number
#side effects: none

sub lastRowNum {
	my $tableRef = shift ( @_ );
	my $rowName = shift ( @_ );
		
	my $qryAns="";
	$qry = "SELECT $tableRef.$rowName FROM $tableRef ORDER by $tableRef.$rowName DESC LIMIT 1 "; #MySQL certified
	(my $Ok, $qryAns)= dbTools::MySQLqry( $qry, "get last row number from $tableRef" );
	if( !$Ok ) {
	    print STDOUT $qryAns. "Failed to get last $rowName from table ". $tableRef. "<br>\n";
	    return 0;
	}  elsf {
	    my $rowRef = $qryAns->fetchrow_hashref;
	    return $$rowRef{'$rowName'};
	}
}