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 '1995-03-01'
	and l_shipdate > date '1995-03-01'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2760832.01..2760832.04 rows=10 width=20) (actual time=62265.883..62265.889 rows=10 loops=1)
   Buffers: shared hit=697346 read=669616 written=4
   ->  Sort  (cost=2760832.01..2768727.12 rows=3158044 width=20) (actual time=62265.879..62265.881 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=697346 read=669616 written=4
         ->  HashAggregate  (cost=2661007.37..2692587.81 rows=3158044 width=20) (actual time=62163.777..62244.800 rows=113994 loops=1)
               Buffers: shared hit=697340 read=669616 written=4
               ->  Hash Join  (cost=626823.78..2613636.71 rows=3158044 width=20) (actual time=23250.693..61704.048 rows=301823 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=697340 read=669616 written=4
                     ->  Seq Scan on lineitem  (cost=0.00..1831532.52 rows=32986659 width=12) (actual time=0.047..19885.837 rows=32714262 loops=1)
                           Filter: (l_shipdate > '1995-03-01'::date)
                           Rows Removed by Filter: 27329820
                           Buffers: shared hit=443671 read=631305 written=4
                     ->  Hash  (cost=608711.57..608711.57 rows=1448977 width=12) (actual time=23248.452..23248.452 rows=1445673 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62119kB
                           Buffers: shared hit=253669 read=38311
                           ->  Hash Join  (cost=49703.11..608711.57 rows=1448977 width=12) (actual time=1025.337..22454.179 rows=1445673 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=253669 read=38311
                                 ->  Seq Scan on orders  (cost=0.00..444735.19 rows=7256982 width=16) (actual time=0.016..5308.513 rows=7209350 loops=1)
                                       Filter: (o_orderdate < '1995-03-01'::date)
                                       Rows Removed by Filter: 7805650
                                       Buffers: shared hit=253667 read=1881
                                 ->  Hash  (cost=45959.36..45959.36 rows=299500 width=4) (actual time=1025.034..1025.034 rows=300276 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10557kB
                                       Buffers: shared hit=2 read=36430
                                       ->  Bitmap Heap Scan on customer  (cost=6937.61..45959.36 rows=299500 width=4) (actual time=77.699..881.874 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Buffers: shared hit=2 read=36430
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6862.73 rows=299500 width=0) (actual time=68.205..68.205 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared read=1155
 Total runtime: 62312.240 ms
(35 rows)

COMMIT;
COMMIT