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 = 'HOUSEHOLD'
	and c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate < date '1995-03-16'
	and l_shipdate > date '1995-03-16'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2766010.35..2766010.37 rows=10 width=20) (actual time=72304.292..72304.295 rows=10 loops=1)
   Buffers: shared hit=486854 read=881427 dirtied=1050 written=1053
   ->  Sort  (cost=2766010.35..2773975.98 rows=3186252 width=20) (actual time=72304.287..72304.289 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=486854 read=881427 dirtied=1050 written=1053
         ->  HashAggregate  (cost=2665294.06..2697156.58 rows=3186252 width=20) (actual time=72221.305..72283.799 rows=113109 loops=1)
               Buffers: shared hit=486848 read=881427 dirtied=1050 written=1053
               ->  Hash Join  (cost=629764.66..2617500.28 rows=3186252 width=20) (actual time=23892.299..71803.484 rows=298445 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=486848 read=881427 dirtied=1050 written=1053
                     ->  Seq Scan on lineitem  (cost=0.00..1833346.69 rows=32673712 width=12) (actual time=0.057..24879.507 rows=32338914 loops=1)
                           Filter: (l_shipdate > '1995-03-16'::date)
                           Rows Removed by Filter: 27705262
                           Buffers: shared hit=217283 read=858763 dirtied=1050 written=1051
                     ->  Hash  (cost=611297.37..611297.37 rows=1477383 width=12) (actual time=23890.132..23890.132 rows=1456923 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62603kB
                           Buffers: shared hit=269565 read=22664 written=2
                           ->  Hash Join  (cost=49722.08..611297.37 rows=1477383 width=12) (actual time=975.899..23141.081 rows=1456923 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=269565 read=22664 written=2
                                 ->  Seq Scan on orders  (cost=0.00..445175.49 rows=7390980 width=16) (actual time=0.014..6086.030 rows=7303439 loops=1)
                                       Filter: (o_orderdate < '1995-03-16'::date)
                                       Rows Removed by Filter: 7711561
                                       Buffers: shared hit=253963 read=1838 written=2
                                 ->  Hash  (cost=45974.14..45974.14 rows=299835 width=4) (actual time=975.653..975.653 rows=299751 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10539kB
                                       Buffers: shared hit=15602 read=20826
                                       ->  Bitmap Heap Scan on customer  (cost=6948.20..45974.14 rows=299835 width=4) (actual time=115.351..813.257 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Buffers: shared hit=15602 read=20826
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6873.24 rows=299835 width=0) (actual time=101.998..101.998 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1153
 Total runtime: 72357.244 ms
(35 rows)

COMMIT;
COMMIT