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 '1995-03-15'
	and l_shipdate > date '1995-03-15'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2741240.27..2741240.30 rows=10 width=20) (actual time=49307.343..49307.348 rows=10 loops=1)
   Buffers: shared hit=839000 read=517435
   ->  Sort  (cost=2741240.27..2749132.15 rows=3156750 width=20) (actual time=49307.336..49307.339 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=839000 read=517435
         ->  HashAggregate  (cost=2641456.54..2673024.04 rows=3156750 width=20) (actual time=49233.108..49288.832 rows=114128 loops=1)
               Buffers: shared hit=838994 read=517435
               ->  Hash Join  (cost=624181.68..2594105.29 rows=3156750 width=20) (actual time=18306.230..48956.530 rows=302423 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=838994 read=517435
                     ->  Seq Scan on lineitem  (cost=0.00..1817050.21 rows=32348238 width=12) (actual time=0.037..17458.207 rows=32366276 loops=1)
                           Filter: (l_shipdate > '1995-03-15'::date)
                           Rows Removed by Filter: 27679393
                           Buffers: shared hit=550195 read=516280
                     ->  Hash  (cost=605865.95..605865.95 rows=1465259 width=12) (actual time=18303.868..18303.868 rows=1463368 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62880kB
                           Buffers: shared hit=288799 read=1155
                           ->  Hash Join  (cost=49808.54..605865.95 rows=1465259 width=12) (actual time=430.046..17735.026 rows=1463368 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=288799 read=1155
                                 ->  Seq Scan on orders  (cost=0.00..441209.30 rows=7286947 width=16) (actual time=0.015..4728.087 rows=7296828 loops=1)
                                       Filter: (o_orderdate < '1995-03-15'::date)
                                       Rows Removed by Filter: 7718172
                                       Buffers: shared hit=253522
                                 ->  Hash  (cost=46038.29..46038.29 rows=301620 width=4) (actual time=429.815..429.815 rows=300276 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10557kB
                                       Buffers: shared hit=35277 read=1155
                                       ->  Bitmap Heap Scan on customer  (cost=6990.04..46038.29 rows=301620 width=4) (actual time=70.744..361.393 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..6914.63 rows=301620 width=0) (actual time=62.320..62.320 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared read=1155
 Total runtime: 49339.143 ms
(35 rows)

COMMIT;
COMMIT