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 '1995-03-18'
	and l_shipdate > date '1995-03-18'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2668250.30..2668250.33 rows=10 width=20) (actual time=27996.367..27996.370 rows=10 loops=1)
   Buffers: shared hit=803071 read=553359
   ->  Sort  (cost=2668250.30..2676140.00 rows=3155879 width=20) (actual time=27996.363..27996.363 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=803071 read=553359
         ->  HashAggregate  (cost=2568494.10..2600052.89 rows=3155879 width=20) (actual time=27940.637..27977.617 rows=113184 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=803065 read=553359
               ->  Hash Join  (cost=551476.46..2521155.92 rows=3155879 width=20) (actual time=7223.705..27733.190 rows=299040 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=803065 read=553359
                     ->  Seq Scan on lineitem  (cost=0.00..1817040.60 rows=32288019 width=12) (actual time=0.029..16003.933 rows=32290776 loops=1)
                           Filter: (l_shipdate > '1995-03-18'::date)
                           Rows Removed by Filter: 27754893
                           Buffers: shared hit=514268 read=552207
                     ->  Hash  (cost=533131.62..533131.62 rows=1467587 width=12) (actual time=7215.952..7215.952 rows=1459400 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79093kB
                           Buffers: shared hit=288797 read=1152
                           ->  Hash Join  (cost=49726.44..533131.62 rows=1467587 width=12) (actual time=459.053..6788.944 rows=1459400 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=288797 read=1152
                                 ->  Seq Scan on orders  (cost=0.00..441209.30 rows=7338668 width=16) (actual time=0.015..4356.594 rows=7315744 loops=1)
                                       Filter: (o_orderdate < '1995-03-18'::date)
                                       Rows Removed by Filter: 7699256
                                       Buffers: shared hit=253522
                                 ->  Hash  (cost=45976.82..45976.82 rows=299970 width=4) (actual time=456.669..456.669 rows=299751 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14635kB
                                       Buffers: shared hit=35275 read=1152
                                       ->  Bitmap Heap Scan on customer  (cost=6949.19..45976.82 rows=299970 width=4) (actual time=67.130..375.074 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=35275 read=1152
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6874.20 rows=299970 width=0) (actual time=58.726..58.726 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1152
 Planning time: 5.870 ms
 Execution time: 28016.513 ms
(38 rows)

COMMIT;
COMMIT