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 '1995-03-21'
	and l_shipdate > date '1995-03-21'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2773840.83..2773840.85 rows=10 width=20) (actual time=105663.813..105663.818 rows=10 loops=1)
   Buffers: shared hit=640030 read=732229 dirtied=32 written=34
   ->  Sort  (cost=2773840.83..2781823.12 rows=3192918 width=20) (actual time=105663.808..105663.812 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=640030 read=732229 dirtied=32 written=34
         ->  HashAggregate  (cost=2672913.84..2704843.02 rows=3192918 width=20) (actual time=105569.300..105641.785 rows=113400 loops=1)
               Buffers: shared hit=640024 read=732229 dirtied=32 written=34
               ->  Hash Join  (cost=631699.38..2625020.07 rows=3192918 width=20) (actual time=28916.408..104929.807 rows=300265 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=640024 read=732229 dirtied=32 written=34
                     ->  Seq Scan on lineitem  (cost=0.00..1838828.79 rows=32683392 width=12) (actual time=0.032..50785.536 rows=32214589 loops=1)
                           Filter: (l_shipdate > '1995-03-21'::date)
                           Rows Removed by Filter: 27830708
                           Buffers: shared hit=369219 read=710043 dirtied=32 written=32
                     ->  Hash  (cost=613144.04..613144.04 rows=1484427 width=12) (actual time=28914.499..28914.499 rows=1466656 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 63021kB
                           Buffers: shared hit=270805 read=22186 written=2
                           ->  Hash Join  (cost=49725.19..613144.04 rows=1484427 width=12) (actual time=1465.768..27725.311 rows=1466656 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=270805 read=22186 written=2
                                 ->  Seq Scan on orders  (cost=0.00..446496.39 rows=7423869 width=16) (actual time=0.016..7739.880 rows=7334712 loops=1)
                                       Filter: (o_orderdate < '1995-03-21'::date)
                                       Rows Removed by Filter: 7680288
                                       Buffers: shared hit=235529 read=21031 written=2
                                 ->  Hash  (cost=45976.06..45976.06 rows=299930 width=4) (actual time=1465.532..1465.532 rows=300441 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10563kB
                                       Buffers: shared hit=35276 read=1155
                                       ->  Bitmap Heap Scan on customer  (cost=6948.94..45976.06 rows=299930 width=4) (actual time=207.856..1282.440 rows=300441 loops=1)
                                             Recheck Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                             Buffers: shared hit=35276 read=1155
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6873.96 rows=299930 width=0) (actual time=190.208..190.208 rows=300441 loops=1)
                                                   Index Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                                   Buffers: shared read=1155
 Total runtime: 105708.002 ms
(35 rows)

COMMIT;
COMMIT