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 '1995-03-25'
	and l_shipdate > date '1995-03-25'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2770324.20..2770324.22 rows=10 width=20) (actual time=84390.163..84390.167 rows=10 loops=1)
   Buffers: shared hit=701544 read=669388
   ->  Sort  (cost=2770324.20..2778281.29 rows=3182838 width=20) (actual time=84390.159..84390.161 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=701544 read=669388
         ->  HashAggregate  (cost=2669715.83..2701544.21 rows=3182838 width=20) (actual time=84251.259..84362.623 rows=113564 loops=1)
               Buffers: shared hit=701538 read=669388
               ->  Hash Join  (cost=631498.97..2621973.26 rows=3182838 width=20) (actual time=27356.769..83709.196 rows=300597 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=701538 read=669388
                     ->  Seq Scan on lineitem  (cost=0.00..1837006.71 rows=32437120 width=12) (actual time=0.069..31800.524 rows=32115065 loops=1)
                           Filter: (l_shipdate > '1995-03-25'::date)
                           Rows Removed by Filter: 27929929
                           Buffers: shared hit=409969 read=668219
                     ->  Hash  (cost=612880.16..612880.16 rows=1489505 width=12) (actual time=27353.672..27353.672 rows=1471652 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 63236kB
                           Buffers: shared hit=291569 read=1169
                           ->  Hash Join  (cost=49762.24..612880.16 rows=1489505 width=12) (actual time=831.230..26151.432 rows=1471652 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=291569 read=1169
                                 ->  Seq Scan on orders  (cost=0.00..446056.09 rows=7430311 width=16) (actual time=0.032..7267.396 rows=7359453 loops=1)
                                       Filter: (o_orderdate < '1995-03-25'::date)
                                       Rows Removed by Filter: 7655547
                                       Buffers: shared hit=256296 read=11
                                 ->  Hash  (cost=46003.55..46003.55 rows=300695 width=4) (actual time=830.887..830.887 rows=300441 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10563kB
                                       Buffers: shared hit=35273 read=1158
                                       ->  Bitmap Heap Scan on customer  (cost=6966.87..46003.55 rows=300695 width=4) (actual time=117.431..699.511 rows=300441 loops=1)
                                             Recheck Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                             Buffers: shared hit=35273 read=1158
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6891.69 rows=300695 width=0) (actual time=104.863..104.863 rows=300441 loops=1)
                                                   Index Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                                   Buffers: shared read=1155
 Total runtime: 84442.538 ms
(35 rows)

COMMIT;
COMMIT