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 '1995-03-30'
	and l_shipdate > date '1995-03-30'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2696338.54..2696338.56 rows=10 width=20) (actual time=38993.018..38993.022 rows=10 loops=1)
   Buffers: shared hit=796810 read=575445 written=100
   ->  Sort  (cost=2696338.54..2704227.32 rows=3155513 width=20) (actual time=38993.014..38993.014 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=796810 read=575445 written=100
         ->  HashAggregate  (cost=2596593.91..2628149.04 rows=3155513 width=20) (actual time=38899.297..38973.380 rows=113087 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=796804 read=575445 written=100
               ->  Hash Join  (cost=557342.14..2549261.21 rows=3155513 width=20) (actual time=12460.056..38610.107 rows=298009 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=796804 read=575445 written=100
                     ->  Seq Scan on lineitem  (cost=0.00..1838829.90 rows=32409078 width=12) (actual time=0.039..18285.911 rows=31989646 loops=1)
                           Filter: (l_shipdate > '1995-03-30'::date)
                           Rows Removed by Filter: 28055651
                           Buffers: shared hit=613125 read=466137
                     ->  Hash  (cost=538848.96..538848.96 rows=1479454 width=12) (actual time=12444.337..12444.337 rows=1474208 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79729kB
                           Buffers: shared hit=183679 read=109308 written=100
                           ->  Hash Join  (cost=49634.91..538848.96 rows=1479454 width=12) (actual time=1018.566..11585.600 rows=1474208 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=183679 read=109308 written=100
                                 ->  Seq Scan on orders  (cost=0.00..446496.39 rows=7446167 width=16) (actual time=0.025..5935.212 rows=7390489 loops=1)
                                       Filter: (o_orderdate < '1995-03-30'::date)
                                       Rows Removed by Filter: 7624511
                                       Buffers: shared hit=183677 read=72883 written=22
                                 ->  Hash  (cost=45909.54..45909.54 rows=298030 width=4) (actual time=1014.542..1014.542 rows=299751 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14635kB
                                       Buffers: shared hit=2 read=36425 written=78
                                       ->  Bitmap Heap Scan on customer  (cost=6906.16..45909.54 rows=298030 width=4) (actual time=115.671..904.523 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=2 read=36425 written=78
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6831.65 rows=298030 width=0) (actual time=103.266..103.266 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1152
 Planning time: 6.989 ms
 Execution time: 39027.711 ms
(38 rows)

COMMIT;
COMMIT