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 '1995-03-27'
	and l_shipdate > date '1995-03-27'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2699669.89..2699669.92 rows=10 width=20) (actual time=38674.110..38674.115 rows=10 loops=1)
   Buffers: shared hit=861851 read=510404 written=233
   ->  Sort  (cost=2699669.89..2707660.39 rows=3196198 width=20) (actual time=38674.106..38674.107 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=861851 read=510404 written=233
         ->  HashAggregate  (cost=2598639.22..2630601.20 rows=3196198 width=20) (actual time=38593.856..38653.533 rows=113148 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=861845 read=510404 written=233
               ->  Hash Join  (cost=557732.81..2550696.25 rows=3196198 width=20) (actual time=10120.883..38296.981 rows=298338 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=861845 read=510404 written=233
                     ->  Seq Scan on lineitem  (cost=0.00..1838832.43 rows=32578412 width=12) (actual time=0.041..19768.537 rows=32064791 loops=1)
                           Filter: (l_shipdate > '1995-03-27'::date)
                           Rows Removed by Filter: 27980506
                           Buffers: shared hit=705356 read=373906 written=2
                     ->  Hash  (cost=539098.56..539098.56 rows=1490740 width=12) (actual time=10104.191..10104.191 rows=1470491 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79570kB
                           Buffers: shared hit=156489 read=136498 written=231
                           ->  Hash Join  (cost=49712.62..539098.56 rows=1490740 width=12) (actual time=625.781..9323.559 rows=1470491 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=156489 read=136498 written=231
                                 ->  Seq Scan on orders  (cost=0.00..446496.39 rows=7461906 width=16) (actual time=0.028..5704.575 rows=7371973 loops=1)
                                       Filter: (o_orderdate < '1995-03-27'::date)
                                       Rows Removed by Filter: 7643027
                                       Buffers: shared hit=131498 read=125062 written=231
                                 ->  Hash  (cost=45966.74..45966.74 rows=299670 width=4) (actual time=622.310..622.310 rows=299751 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14635kB
                                       Buffers: shared hit=24991 read=11436
                                       ->  Bitmap Heap Scan on customer  (cost=6942.87..45966.74 rows=299670 width=4) (actual time=77.719..528.958 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=24991 read=11436
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6867.95 rows=299670 width=0) (actual time=68.050..68.050 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1152
 Planning time: 4.202 ms
 Execution time: 38701.652 ms
(38 rows)

COMMIT;
COMMIT