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 '1995-03-07'
	and l_shipdate > date '1995-03-07'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2773221.67..2773221.69 rows=10 width=20) (actual time=147044.902..147044.906 rows=10 loops=1)
   Buffers: shared hit=797826 read=574433 written=4
   ->  Sort  (cost=2773221.67..2781207.85 rows=3194472 width=20) (actual time=147044.897..147044.898 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=797826 read=574433 written=4
         ->  HashAggregate  (cost=2672245.55..2704190.27 rows=3194472 width=20) (actual time=146955.829..147022.067 rows=113392 loops=1)
               Buffers: shared hit=797820 read=574433 written=4
               ->  Hash Join  (cost=630265.00..2624328.47 rows=3194472 width=20) (actual time=40872.465..146157.249 rows=299548 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=797820 read=574433 written=4
                     ->  Seq Scan on lineitem  (cost=0.00..1838822.86 rows=32878905 width=12) (actual time=0.061..79125.128 rows=32564906 loops=1)
                           Filter: (l_shipdate > '1995-03-07'::date)
                           Rows Removed by Filter: 27480391
                           Buffers: shared hit=507369 read=571893 written=4
                     ->  Hash  (cost=611811.02..611811.02 rows=1476318 width=12) (actual time=40870.405..40870.405 rows=1449062 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62265kB
                           Buffers: shared hit=290451 read=2540
                           ->  Hash Join  (cost=49840.12..611811.02 rows=1476318 width=12) (actual time=1968.677..39214.058 rows=1449062 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=290451 read=2540
                                 ->  Seq Scan on orders  (cost=0.00..446496.39 rows=7324461 width=16) (actual time=0.025..15178.697 rows=7247058 loops=1)
                                       Filter: (o_orderdate < '1995-03-07'::date)
                                       Rows Removed by Filter: 7767942
                                       Buffers: shared hit=256215 read=345
                                 ->  Hash  (cost=46060.87..46060.87 rows=302340 width=4) (actual time=1968.339..1968.339 rows=300441 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10563kB
                                       Buffers: shared hit=34236 read=2195
                                       ->  Bitmap Heap Scan on customer  (cost=7003.62..46060.87 rows=302340 width=4) (actual time=231.980..1782.835 rows=300441 loops=1)
                                             Recheck Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                             Buffers: shared hit=34236 read=2195
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6928.03 rows=302340 width=0) (actual time=218.884..218.884 rows=300441 loops=1)
                                                   Index Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                                   Buffers: shared read=1155
 Total runtime: 147472.998 ms
(35 rows)

COMMIT;
COMMIT