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 '1995-03-02'
	and l_shipdate > date '1995-03-02'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2774926.38..2774926.40 rows=10 width=20) (actual time=110892.880..110892.882 rows=10 loops=1)
   Buffers: shared hit=840951 read=532619 dirtied=202 written=6
   ->  Sort  (cost=2774926.38..2782873.82 rows=3178977 width=20) (actual time=110892.876..110892.877 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=840951 read=532619 dirtied=202 written=6
         ->  HashAggregate  (cost=2674440.06..2706229.83 rows=3178977 width=20) (actual time=110797.588..110867.180 rows=114034 loops=1)
               Buffers: shared hit=840945 read=532619 dirtied=202 written=6
               ->  Hash Join  (cost=629927.03..2626755.40 rows=3178977 width=20) (actual time=35915.462..110195.563 rows=301791 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=840945 read=532619 dirtied=202 written=6
                     ->  Seq Scan on lineitem  (cost=0.00..1840629.69 rows=33175709 width=12) (actual time=0.041..47347.346 rows=32690033 loops=1)
                           Filter: (l_shipdate > '1995-03-02'::date)
                           Rows Removed by Filter: 27355000
                           Buffers: shared hit=610646 read=469673
                     ->  Hash  (cost=611708.92..611708.92 rows=1457449 width=12) (actual time=35913.564..35913.564 rows=1446924 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62173kB
                           Buffers: shared hit=230299 read=62946 dirtied=202 written=6
                           ->  Hash Join  (cost=49684.86..611708.92 rows=1457449 width=12) (actual time=2578.082..33921.467 rows=1446924 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=230299 read=62946 dirtied=202 written=6
                                 ->  Seq Scan on orders  (cost=0.00..446936.69 rows=7310028 width=16) (actual time=0.016..11079.129 rows=7215550 loops=1)
                                       Filter: (o_orderdate < '1995-03-02'::date)
                                       Rows Removed by Filter: 7799450
                                       Buffers: shared hit=209496 read=47317 dirtied=202 written=6
                                 ->  Hash  (cost=45946.55..45946.55 rows=299065 width=4) (actual time=2577.831..2577.831 rows=300276 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10557kB
                                       Buffers: shared hit=20803 read=15629
                                       ->  Bitmap Heap Scan on customer  (cost=6930.23..45946.55 rows=299065 width=4) (actual time=208.498..2376.751 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Buffers: shared hit=20803 read=15629
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6855.47 rows=299065 width=0) (actual time=197.498..197.498 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared hit=3 read=1152
 Total runtime: 110935.354 ms
(35 rows)

COMMIT;
COMMIT