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 '1995-03-29'
	and l_shipdate > date '1995-03-29'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2698792.36..2698792.38 rows=10 width=20) (actual time=32512.480..32512.484 rows=10 loops=1)
   Buffers: shared hit=844411 read=527516 written=3653
   ->  Sort  (cost=2698792.36..2706778.44 rows=3194434 width=20) (actual time=32512.478..32512.480 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=844411 read=527516 written=3653
         ->  HashAggregate  (cost=2597817.45..2629761.79 rows=3194434 width=20) (actual time=32440.512..32491.108 rows=112968 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=844405 read=527516 written=3653
               ->  Hash Join  (cost=557314.72..2549900.94 rows=3194434 width=20) (actual time=8648.974..32187.639 rows=297863 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=844405 read=527516 written=3653
                     ->  Seq Scan on lineitem  (cost=0.00..1838704.65 rows=32516593 width=12) (actual time=0.030..17995.436 rows=31982465 loops=1)
                           Filter: (l_shipdate > '1995-03-29'::date)
                           Rows Removed by Filter: 28002387
                           Buffers: shared hit=628740 read=450447
                     ->  Hash  (cost=538673.75..538673.75 rows=1491278 width=12) (actual time=8635.776..8635.776 rows=1471582 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79617kB
                           Buffers: shared hit=215665 read=77069 written=3653
                           ->  Hash Join  (cost=49712.62..538673.75 rows=1491278 width=12) (actual time=831.050..8075.210 rows=1471582 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=215665 read=77069 written=3653
                                 ->  Seq Scan on orders  (cost=0.00..446056.09 rows=7464603 width=16) (actual time=0.028..4660.138 rows=7376933 loops=1)
                                       Filter: (o_orderdate < '1995-03-29'::date)
                                       Rows Removed by Filter: 7623067
                                       Buffers: shared hit=215663 read=40644 written=104
                                 ->  Hash  (cost=45966.74..45966.74 rows=299670 width=4) (actual time=827.747..827.747 rows=299751 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14635kB
                                       Buffers: shared hit=2 read=36425 written=3549
                                       ->  Bitmap Heap Scan on customer  (cost=6942.87..45966.74 rows=299670 width=4) (actual time=73.006..727.828 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=2 read=36425 written=3549
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6867.95 rows=299670 width=0) (actual time=63.918..63.918 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1152 written=83
 Planning time: 4.071 ms
 Execution time: 32543.680 ms
(38 rows)

COMMIT;
COMMIT