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 '1995-03-20'
	and l_shipdate > date '1995-03-20'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2672693.86..2672693.88 rows=10 width=20) (actual time=31272.856..31272.859 rows=10 loops=1)
   Buffers: shared hit=623114 read=735955
   ->  Sort  (cost=2672693.86..2680571.69 rows=3151131 width=20) (actual time=31272.850..31272.852 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=623114 read=735955
         ->  HashAggregate  (cost=2573087.74..2604599.05 rows=3151131 width=20) (actual time=31204.593..31254.101 rows=113020 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=623108 read=735955
               ->  Hash Join  (cost=552351.23..2525820.78 rows=3151131 width=20) (actual time=8636.110..30982.805 rows=298290 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=623108 read=735955
                     ->  Seq Scan on lineitem  (cost=0.00..1820677.48 rows=32341536 width=12) (actual time=0.063..16518.225 rows=32207961 loops=1)
                           Filter: (l_shipdate > '1995-03-20'::date)
                           Rows Removed by Filter: 27777692
                           Buffers: shared hit=538847 read=529761
                     ->  Hash  (cost=534027.81..534027.81 rows=1465874 width=12) (actual time=8620.977..8620.977 rows=1460356 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79134kB
                           Buffers: shared hit=84261 read=206194
                           ->  Hash Join  (cost=49659.61..534027.81 rows=1465874 width=12) (actual time=676.819..8003.158 rows=1460356 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=84261 read=206194
                                 ->  Seq Scan on orders  (cost=0.00..442089.90 rows=7365214 width=16) (actual time=0.013..4808.937 rows=7320993 loops=1)
                                       Filter: (o_orderdate < '1995-03-20'::date)
                                       Rows Removed by Filter: 7679007
                                       Buffers: shared hit=84259 read=169769
                                 ->  Hash  (cost=45927.86..45927.86 rows=298540 width=4) (actual time=673.237..673.237 rows=299751 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14635kB
                                       Buffers: shared hit=2 read=36425
                                       ->  Bitmap Heap Scan on customer  (cost=6918.11..45927.86 rows=298540 width=4) (actual time=68.011..570.847 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=2 read=36425
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6843.48 rows=298540 width=0) (actual time=59.662..59.662 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1152
 Planning time: 6.007 ms
 Execution time: 31296.888 ms
(38 rows)

COMMIT;
COMMIT