=>explain select client_id,ip_to,place,t_t,sum(bytes) from inet_trafic_today where date_part('day',tm)= 2  group by client_id,ip_to,place,t_t;
                                  QUERY PLAN
-------------------------------------------------------------------------------
 HashAggregate  (cost= 22944 . 89 .. 22955 . 88  rows= 4396  width= 25 )
   ->  Seq Scan on inet_trafic_today  (cost= 0 . 00 .. 22889 . 94  rows= 4396  width= 25 )
         Filter: (date_part('day'::text, tm) =  2 ::double precision)
(ЪБРЙУЕК:  3 )

=> explain select client_id,ip_to,place,t_t,sum(bytes) from inet_trafic_today  group by client_id,ip_to,place,t_t;                                                      QUERY PLAN
---------------------------------------------------------------------------------------
 GroupAggregate  (cost= 116464 . 54 .. 131849 . 30  rows= 879129  width= 25 )
   ->  Sort  (cost= 116464 . 54 .. 118662 . 37  rows= 879129  width= 25 )
         Sort Key: client_id, ip_to, place, t_t
         ->  Seq Scan on inet_trafic_today  (cost= 0 . 00 .. 18494 . 29  rows= 879129  width= 25 )
(ЪБРЙУЕК:  4 )