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TABLE
data_set | field1 | field2 | field3 
...
  yes   |   0    | HELLO  
  no    |   0    | HEY    
  no    |   1    | HELLO

    my ($data_set_01, $data_set_02, $format, @data_cat) = @_;
    my ($dbh, $sth, $sql_01, $sql_02);
...
            @ds2_rows = ();
        }