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 '1995-03-10'
	and l_shipdate > date '1995-03-10'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2740536.77..2740536.80 rows=10 width=20) (actual time=48218.022..48218.026 rows=10 loops=1)
   Buffers: shared hit=839070 read=517361
   ->  Sort  (cost=2740536.77..2748404.24 rows=3146987 width=20) (actual time=48217.966..48217.969 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=839070 read=517361
         ->  HashAggregate  (cost=2641061.64..2672531.51 rows=3146987 width=20) (actual time=48139.844..48199.893 rows=113132 loops=1)
               Buffers: shared hit=839064 read=517361
               ->  Hash Join  (cost=623572.88..2593856.84 rows=3146987 width=20) (actual time=16199.165..47898.363 rows=298677 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=839064 read=517361
                     ->  Seq Scan on lineitem  (cost=0.00..1817043.50 rows=32472156 width=12) (actual time=0.033..17868.281 rows=32491428 loops=1)
                           Filter: (l_shipdate > '1995-03-10'::date)
                           Rows Removed by Filter: 27554241
                           Buffers: shared hit=550267 read=516208
                     ->  Hash  (cost=605383.47..605383.47 rows=1455153 width=12) (actual time=16196.894..16196.894 rows=1449327 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62276kB
                           Buffers: shared hit=288797 read=1153
                           ->  Hash Join  (cost=49752.35..605383.47 rows=1455153 width=12) (actual time=410.901..15726.636 rows=1449327 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=288797 read=1153
                                 ->  Seq Scan on orders  (cost=0.00..441209.30 rows=7263294 width=16) (actual time=0.014..4684.259 rows=7265540 loops=1)
                                       Filter: (o_orderdate < '1995-03-10'::date)
                                       Rows Removed by Filter: 7749460
                                       Buffers: shared hit=253522
                                 ->  Hash  (cost=45995.91..45995.91 rows=300515 width=4) (actual time=410.697..410.697 rows=299751 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10539kB
                                       Buffers: shared hit=35275 read=1153
                                       ->  Bitmap Heap Scan on customer  (cost=6961.47..45995.91 rows=300515 width=4) (actual time=71.430..342.290 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..6886.34 rows=300515 width=0) (actual time=62.994..62.994 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1153
 Total runtime: 48269.108 ms
(35 rows)

COMMIT;
COMMIT