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 '1995-03-12'
	and l_shipdate > date '1995-03-12'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2776556.07..2776556.10 rows=10 width=20) (actual time=83261.976..83261.981 rows=10 loops=1)
   Buffers: shared hit=790246 read=584640 written=52
   ->  Sort  (cost=2776556.07..2784477.49 rows=3168568 width=20) (actual time=83261.971..83261.974 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=790246 read=584640 written=52
         ->  HashAggregate  (cost=2676398.78..2708084.46 rows=3168568 width=20) (actual time=83174.482..83240.304 rows=114118 loops=1)
               Buffers: shared hit=790240 read=584640 written=52
               ->  Hash Join  (cost=631423.78..2628870.26 rows=3168568 width=20) (actual time=26628.704..82639.684 rows=302067 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=790240 read=584640 written=52
                     ->  Seq Scan on lineitem  (cost=0.00..1842441.31 rows=32885195 width=12) (actual time=0.085..31130.366 rows=32440212 loops=1)
                           Filter: (l_shipdate > '1995-03-12'::date)
                           Rows Removed by Filter: 27604581
                           Buffers: shared hit=501288 read=580094
                     ->  Hash  (cost=613086.86..613086.86 rows=1466954 width=12) (actual time=26626.029..26626.029 rows=1459506 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62714kB
                           Buffers: shared hit=288952 read=4546 written=52
                           ->  Hash Join  (cost=49651.57..613086.86 rows=1466954 width=12) (actual time=889.050..25318.679 rows=1459506 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=288952 read=4546 written=52
                                 ->  Seq Scan on orders  (cost=0.00..447376.99 rows=7373728 width=16) (actual time=0.027..6875.728 rows=7278161 loops=1)
                                       Filter: (o_orderdate < '1995-03-12'::date)
                                       Rows Removed by Filter: 7736839
                                       Buffers: shared hit=253682 read=3384 written=27
                                 ->  Hash  (cost=45921.38..45921.38 rows=298415 width=4) (actual time=888.752..888.752 rows=300276 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10557kB
                                       Buffers: shared hit=35270 read=1162 written=25
                                       ->  Bitmap Heap Scan on customer  (cost=6913.20..45921.38 rows=298415 width=4) (actual time=118.997..731.213 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Buffers: shared hit=35270 read=1162 written=25
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6838.59 rows=298415 width=0) (actual time=106.397..106.397 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared hit=2 read=1153 written=25
 Total runtime: 83313.866 ms
(35 rows)

COMMIT;
COMMIT