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        my $id_string = '1,2';
        my $value_lookup = $dbh->prepare("
...
        while(my($value) = $value_lookup->fetchrow_array()) {
            print "$value\n";
        }

        my $value_lookup = $dbh->prepare("
            SELECT
...
        while(my($value) = $value_lookup->fetchrow_array()) {
            print "$value\n";
        }