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 '1995-03-22'
	and l_shipdate > date '1995-03-22'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2776610.82..2776610.85 rows=10 width=20) (actual time=95334.155..95334.160 rows=10 loops=1)
   Buffers: shared hit=982187 read=391383 written=62
   ->  Sort  (cost=2776610.82..2784616.56 rows=3202296 width=20) (actual time=95334.150..95334.152 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=982187 read=391383 written=62
         ->  HashAggregate  (cost=2675387.40..2707410.36 rows=3202296 width=20) (actual time=95243.831..95313.834 rows=114156 loops=1)
               Buffers: shared hit=982181 read=391383 written=62
               ->  Hash Join  (cost=632633.77..2627352.96 rows=3202296 width=20) (actual time=29813.264..94419.969 rows=302102 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=982181 read=391383 written=62
                     ->  Seq Scan on lineitem  (cost=0.00..1840630.70 rows=32550806 width=12) (actual time=0.059..39346.399 rows=32189575 loops=1)
                           Filter: (l_shipdate > '1995-03-22'::date)
                           Rows Removed by Filter: 27855458
                           Buffers: shared hit=791474 read=288845 written=7
                     ->  Hash  (cost=613929.71..613929.71 rows=1496325 width=12) (actual time=29810.342..29810.342 rows=1472115 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 63255kB
                           Buffers: shared hit=190707 read=102538 written=55
                           ->  Hash Join  (cost=49823.51..613929.71 rows=1496325 width=12) (actual time=1975.214..28773.575 rows=1472115 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=190707 read=102538 written=55
                                 ->  Seq Scan on orders  (cost=0.00..446936.69 rows=7433183 width=16) (actual time=0.030..8214.546 rows=7340960 loops=1)
                                       Filter: (o_orderdate < '1995-03-22'::date)
                                       Rows Removed by Filter: 7674040
                                       Buffers: shared hit=190705 read=66108 written=55
                                 ->  Hash  (cost=46049.07..46049.07 rows=301955 width=4) (actual time=1973.908..1973.908 rows=300276 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10557kB
                                       Buffers: shared hit=2 read=36430
                                       ->  Bitmap Heap Scan on customer  (cost=6996.63..46049.07 rows=301955 width=4) (actual time=140.092..1391.280 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..6921.14 rows=301955 width=0) (actual time=126.616..126.616 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared read=1155
 Total runtime: 95398.909 ms
(35 rows)

COMMIT;
COMMIT