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 '1995-03-18'
	and l_shipdate > date '1995-03-18'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2668757.84..2668757.87 rows=10 width=20) (actual time=27960.023..27960.027 rows=10 loops=1)
   Buffers: shared hit=802615 read=553818
   ->  Sort  (cost=2668757.84..2676662.86 rows=3162009 width=20) (actual time=27960.011..27960.012 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=802615 read=553818
         ->  HashAggregate  (cost=2568807.87..2600427.96 rows=3162009 width=20) (actual time=27905.398..27941.146 rows=113474 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=802609 read=553818
               ->  Hash Join  (cost=551529.01..2521377.74 rows=3162009 width=20) (actual time=7176.897..27705.907 rows=300241 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=802609 read=553818
                     ->  Seq Scan on lineitem  (cost=0.00..1817043.30 rows=32316091 width=12) (actual time=0.026..16040.742 rows=32290776 loops=1)
                           Filter: (l_shipdate > '1995-03-18'::date)
                           Rows Removed by Filter: 27754893
                           Buffers: shared hit=513811 read=552664
                     ->  Hash  (cost=533164.51..533164.51 rows=1469160 width=12) (actual time=7169.316..7169.316 rows=1462627 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79232kB
                           Buffers: shared hit=288798 read=1154
                           ->  Hash Join  (cost=49745.74..533164.51 rows=1469160 width=12) (actual time=427.336..6692.827 rows=1462627 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=288798 read=1154
                                 ->  Seq Scan on orders  (cost=0.00..441209.30 rows=7338097 width=16) (actual time=0.017..4304.321 rows=7315744 loops=1)
                                       Filter: (o_orderdate < '1995-03-18'::date)
                                       Rows Removed by Filter: 7699256
                                       Buffers: shared hit=253522
                                 ->  Hash  (cost=45991.81..45991.81 rows=300315 width=4) (actual time=425.042..425.042 rows=300441 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14659kB
                                       Buffers: shared hit=35276 read=1154
                                       ->  Bitmap Heap Scan on customer  (cost=6959.87..45991.81 rows=300315 width=4) (actual time=66.678..348.326 rows=300441 loops=1)
                                             Recheck Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                             Heap Blocks: exact=35276
                                             Buffers: shared hit=35276 read=1154
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6884.79 rows=300315 width=0) (actual time=58.249..58.249 rows=300441 loops=1)
                                                   Index Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                                   Buffers: shared read=1154
 Planning time: 5.627 ms
 Execution time: 27983.760 ms
(38 rows)

COMMIT;
COMMIT