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 = 'MACHINERY'
	and c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate < date '1995-03-03'
	and l_shipdate > date '1995-03-03'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2748645.04..2748645.06 rows=10 width=20) (actual time=146831.250..146831.256 rows=10 loops=1)
   Buffers: shared hit=652334 read=708050 written=3
   ->  Sort  (cost=2748645.04..2756551.59 rows=3162619 width=20) (actual time=146831.246..146831.248 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=652334 read=708050 written=3
         ->  HashAggregate  (cost=2648675.79..2680301.98 rows=3162619 width=20) (actual time=146732.281..146809.523 rows=113456 loops=1)
               Buffers: shared hit=652328 read=708050 written=3
               ->  Hash Join  (cost=624606.44..2601236.50 rows=3162619 width=20) (actual time=45954.996..146011.026 rows=299754 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=652328 read=708050 written=3
                     ->  Seq Scan on lineitem  (cost=0.00..1822473.40 rows=32674793 width=12) (actual time=0.029..72370.370 rows=32666038 loops=1)
                           Filter: (l_shipdate > '1995-03-03'::date)
                           Rows Removed by Filter: 27379265
                           Buffers: shared hit=438380 read=631286 written=3
                     ->  Hash  (cost=606385.65..606385.65 rows=1457663 width=12) (actual time=45951.166..45951.166 rows=1443941 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62045kB
                           Buffers: shared hit=213948 read=76764
                           ->  Hash Join  (cost=49840.12..606385.65 rows=1457663 width=12) (actual time=4207.211..43662.063 rows=1443941 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=213948 read=76764
                                 ->  Seq Scan on orders  (cost=0.00..442530.20 rows=7231906 width=16) (actual time=0.019..17086.531 rows=7221755 loops=1)
                                       Filter: (o_orderdate < '1995-03-03'::date)
                                       Rows Removed by Filter: 7793245
                                       Buffers: shared hit=213945 read=40336
                                 ->  Hash  (cost=46060.87..46060.87 rows=302340 width=4) (actual time=4206.906..4206.906 rows=300441 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10563kB
                                       Buffers: shared hit=3 read=36428
                                       ->  Bitmap Heap Scan on customer  (cost=7003.62..46060.87 rows=302340 width=4) (actual time=210.256..4008.254 rows=300441 loops=1)
                                             Recheck Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                             Buffers: shared hit=3 read=36428
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6928.03 rows=302340 width=0) (actual time=194.126..194.126 rows=300441 loops=1)
                                                   Index Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                                   Buffers: shared read=1155
 Total runtime: 146885.703 ms
(35 rows)

COMMIT;
COMMIT