text: --+ holdcas on;
  SELECT attr2_str_unique_noidx, attr1_int_unique_idx
         FROM virtual_c2 a
         WHERE EXISTS
               (SELECT * FROM base_c0 b
                         WHERE b.attr10_money_idx = a.attr10_money_idx
                           AND b.attr8_date_idx  > '11/11/1989') order by 1;
  