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 '1995-03-26'
	and l_shipdate > date '1995-03-26'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2688703.87..2688703.90 rows=10 width=20) (actual time=30055.618..30055.622 rows=10 loops=1)
   Buffers: shared hit=1011028 read=355929 written=70
   ->  Sort  (cost=2688703.87..2696653.22 rows=3179740 width=20) (actual time=30055.615..30055.618 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=1011028 read=355929 written=70
         ->  HashAggregate  (cost=2588193.43..2619990.83 rows=3179740 width=20) (actual time=29996.915..30036.856 rows=112930 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=1011022 read=355929 written=70
               ->  Hash Join  (cost=555731.00..2540497.33 rows=3179740 width=20) (actual time=8339.819..29772.649 rows=297924 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=1011022 read=355929 written=70
                     ->  Seq Scan on lineitem  (cost=0.00..1831531.51 rows=32383311 width=12) (actual time=0.032..16705.032 rows=32056859 loops=1)
                           Filter: (l_shipdate > '1995-03-26'::date)
                           Rows Removed by Filter: 27927063
                           Buffers: shared hit=864700 read=210276
                     ->  Hash  (cost=537154.58..537154.58 rows=1486114 width=12) (actual time=8328.265..8328.265 rows=1467858 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79457kB
                           Buffers: shared hit=146322 read=145653 written=70
                           ->  Hash Join  (cost=49764.48..537154.58 rows=1486114 width=12) (actual time=425.823..7731.922 rows=1467858 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=146322 read=145653 written=70
                                 ->  Seq Scan on orders  (cost=0.00..444735.19 rows=7411672 width=16) (actual time=0.016..4998.928 rows=7358489 loops=1)
                                       Filter: (o_orderdate < '1995-03-26'::date)
                                       Rows Removed by Filter: 7641511
                                       Buffers: shared hit=111156 read=144392 written=70
                                 ->  Hash  (cost=46004.92..46004.92 rows=300765 width=4) (actual time=422.853..422.853 rows=299751 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14635kB
                                       Buffers: shared hit=35166 read=1261
                                       ->  Bitmap Heap Scan on customer  (cost=6967.36..46004.92 rows=300765 width=4) (actual time=64.987..346.269 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=35166 read=1261
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6892.16 rows=300765 width=0) (actual time=56.911..56.911 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1152
 Planning time: 3.473 ms
 Execution time: 30083.187 ms
(38 rows)

COMMIT;
COMMIT