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SELECT `status`, `rma_num`, `auth_id`, `vendor`, `part_num` FROM rma_l
+ist WHERE ('status') = ('0');

my $query = "SELECT "
    . join(", ", map { $dbh->quote_identifier($_) } @q_return)
...
    . ") = ("
    . join(', ', ('?') x @q_names)
    . ");";