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 '1995-03-03'
	and l_shipdate > date '1995-03-03'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2672387.45..2672387.47 rows=10 width=20) (actual time=34090.916..34090.921 rows=10 loops=1)
   Buffers: shared hit=822768 read=536001 written=1479
   ->  Sort  (cost=2672387.45..2680248.57 rows=3144449 width=20) (actual time=34090.913..34090.914 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=822768 read=536001 written=1479
         ->  HashAggregate  (cost=2572992.54..2604437.03 rows=3144449 width=20) (actual time=34018.442..34070.502 rows=112936 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=822762 read=536001 written=1479
               ->  Hash Join  (cost=550893.66..2525825.81 rows=3144449 width=20) (actual time=8727.157..33751.428 rows=298031 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=822762 read=536001 written=1479
                     ->  Seq Scan on lineitem  (cost=0.00..1820587.88 rows=32773277 width=12) (actual time=0.051..19054.031 rows=32633826 loops=1)
                           Filter: (l_shipdate > '1995-03-03'::date)
                           Rows Removed by Filter: 27351726
                           Buffers: shared hit=589762 read=478799
                     ->  Hash  (cost=532867.93..532867.93 rows=1442058 width=12) (actual time=8710.239..8710.239 rows=1439126 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78222kB
                           Buffers: shared hit=233000 read=57202 written=1479
                           ->  Hash Join  (cost=49696.83..532867.93 rows=1442058 width=12) (actual time=834.253..8169.751 rows=1439126 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=233000 read=57202 written=1479
                                 ->  Seq Scan on orders  (cost=0.00..441649.60 rows=7226912 width=16) (actual time=0.026..4881.406 rows=7214408 loops=1)
                                       Filter: (o_orderdate < '1995-03-03'::date)
                                       Rows Removed by Filter: 7785592
                                       Buffers: shared hit=232998 read=20777 written=15
                                 ->  Hash  (cost=45955.46..45955.46 rows=299310 width=4) (actual time=831.105..831.105 rows=299751 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14635kB
                                       Buffers: shared hit=2 read=36425 written=1464
                                       ->  Bitmap Heap Scan on customer  (cost=6936.08..45955.46 rows=299310 width=4) (actual time=75.901..736.515 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=2 read=36425 written=1464
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6861.25 rows=299310 width=0) (actual time=66.742..66.742 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1152 written=40
 Planning time: 4.126 ms
 Execution time: 34135.771 ms
(38 rows)

COMMIT;
COMMIT