station_data=# SELECT relname, relkind, reltuples, relpages FROM pg_class WHERE relname LIKE 'speed%';
  relname       | relkind |  reltuples        | relpages
------------------+---------+-------------------+----------
 speed            | r           | 1.39002e+07 |    68138
 speed_pkey | i            |        1000         |        1


station_data=# SELECT attname, n_distinct, most_common_freqs, correlation FROM pg_stats WHERE tablename='speed';
attname          | n_distinct |                                 most_common_freqs                                  | correlation
------------------+--------------+-------------------------------------------------------------------------------+-------------
 set_id            |         13      |                                                                                                           |           1
 rec_time        |     931519| {0.001,0.000666667,0.000666667,0.000666667}                 |   0.0737221
 wind_speed |        136    | {0.0293333,0.0246667,0.0223333,0.021,0.0206667,0.0203333,0.0203333,0.02,0.02,0.02} |   0.0712318