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 = 'BUILDING'
	and c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate < date '1995-03-31'
	and l_shipdate > date '1995-03-31'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2744874.93..2744874.95 rows=10 width=20) (actual time=71311.710..71311.713 rows=10 loops=1)
   Buffers: shared hit=596324 read=761435 written=7
   ->  Sort  (cost=2744874.93..2752779.81 rows=3161953 width=20) (actual time=71311.705..71311.705 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=596324 read=761435 written=7
         ->  HashAggregate  (cost=2644926.73..2676546.26 rows=3161953 width=20) (actual time=71208.514..71289.966 rows=113862 loops=1)
               Buffers: shared hit=596318 read=761435 written=7
               ->  Hash Join  (cost=626852.12..2597497.43 rows=3161953 width=20) (actual time=25807.074..70835.338 rows=301583 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=596318 read=761435 written=7
                     ->  Seq Scan on lineitem  (cost=0.00..1818864.55 rows=32042996 width=12) (actual time=0.049..23658.285 rows=31965617 loops=1)
                           Filter: (l_shipdate > '1995-03-31'::date)
                           Rows Removed by Filter: 28079986
                           Buffers: shared hit=419429 read=648117
                     ->  Hash  (cost=608312.94..608312.94 rows=1483134 width=12) (actual time=25804.785..25804.785 rows=1483208 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 63732kB
                           Buffers: shared hit=176889 read=113318 written=7
                           ->  Hash Join  (cost=49708.25..608312.94 rows=1483134 width=12) (actual time=607.552..23830.013 rows=1483208 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=176889 read=113318 written=7
                                 ->  Seq Scan on orders  (cost=0.00..441649.60 rows=7427182 width=16) (actual time=0.015..5818.739 rows=7396516 loops=1)
                                       Filter: (o_orderdate < '1995-03-31'::date)
                                       Rows Removed by Filter: 7618484
                                       Buffers: shared hit=141612 read=112163 written=7
                                 ->  Hash  (cost=45964.06..45964.06 rows=299535 width=4) (actual time=607.297..607.297 rows=300276 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10557kB
                                       Buffers: shared hit=35277 read=1155
                                       ->  Bitmap Heap Scan on customer  (cost=6941.88..45964.06 rows=299535 width=4) (actual time=87.586..487.399 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Buffers: shared hit=35277 read=1155
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6866.99 rows=299535 width=0) (actual time=69.836..69.836 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared read=1155
 Total runtime: 71365.050 ms
(35 rows)

COMMIT;
COMMIT