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my @query_ids = (5,4,3,2,1);
my $sql = q/select rec_data from foo where id in (/ . join(",", @query
+_ids) . q/) order by id/;
my $results = $dbh->selectall_arrayref($sql);

my @query_ids = (5,4,3,2,1);
my $sql = q/select rec_data from foo where id in (/ . join ",", ("?") 
+x @query_ids .q/) order by id/; print $sql;'
select rec_data from foo where id in (?????) order by id
my $results = $dbh->selectall_arrayref($sql, undef, @query_ids);