BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	l_orderkey,
	sum(l_extendedprice * (1 - l_discount)) as revenue,
	o_orderdate,
	o_shippriority
from
	customer,
	orders,
	lineitem
where
	c_mktsegment = 'HOUSEHOLD'
	and c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate < date '1995-03-25'
	and l_shipdate > date '1995-03-25'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2745866.23..2745866.25 rows=10 width=20) (actual time=95293.252..95293.256 rows=10 loops=1)
   Buffers: shared hit=622957 read=734798 dirtied=252 written=2
   ->  Sort  (cost=2745866.23..2753815.48 rows=3179701 width=20) (actual time=95293.247..95293.249 rows=10 loops=1)
         Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))), orders.o_orderdate
         Sort Method: top-N heapsort  Memory: 25kB
         Buffers: shared hit=622957 read=734798 dirtied=252 written=2
         ->  HashAggregate  (cost=2645357.02..2677154.03 rows=3179701 width=20) (actual time=95189.870..95267.440 rows=113167 loops=1)
               Buffers: shared hit=622951 read=734798 dirtied=252 written=2
               ->  Hash Join  (cost=626152.83..2597661.50 rows=3179701 width=20) (actual time=33083.879..94623.739 rows=298629 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=622951 read=734798 dirtied=252 written=2
                     ->  Seq Scan on lineitem  (cost=0.00..1818867.25 rows=32225176 width=12) (actual time=0.042..36454.780 rows=32115718 loops=1)
                           Filter: (l_shipdate > '1995-03-25'::date)
                           Rows Removed by Filter: 27929885
                           Buffers: shared hit=513398 read=554148
                     ->  Hash  (cost=607615.00..607615.00 rows=1483027 width=12) (actual time=33079.198..33079.198 rows=1467957 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 63077kB
                           Buffers: shared hit=109553 read=180650 dirtied=252 written=2
                           ->  Hash Join  (cost=49822.03..607615.00 rows=1483027 width=12) (actual time=1081.505..31831.706 rows=1467957 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=109553 read=180650 dirtied=252 written=2
                                 ->  Seq Scan on orders  (cost=0.00..441649.60 rows=7368225 width=16) (actual time=0.025..11511.363 rows=7359435 loops=1)
                                       Filter: (o_orderdate < '1995-03-25'::date)
                                       Rows Removed by Filter: 7655565
                                       Buffers: shared hit=74278 read=179497 dirtied=252 written=2
                                 ->  Hash  (cost=46048.16..46048.16 rows=301910 width=4) (actual time=1081.154..1081.154 rows=299751 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10539kB
                                       Buffers: shared hit=35275 read=1153
                                       ->  Bitmap Heap Scan on customer  (cost=6996.28..46048.16 rows=301910 width=4) (actual time=187.846..894.518 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Buffers: shared hit=35275 read=1153
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6920.81 rows=301910 width=0) (actual time=168.184..168.184 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1153
 Total runtime: 95344.574 ms
(35 rows)

COMMIT;
COMMIT