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 '1995-03-13'
	and l_shipdate > date '1995-03-13'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2762506.73..2762506.76 rows=10 width=20) (actual time=136733.245..136733.251 rows=10 loops=1)
   Buffers: shared hit=914779 read=453502 dirtied=1056 written=434
   ->  Sort  (cost=2762506.73..2770376.79 rows=3148023 width=20) (actual time=136733.241..136733.246 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=914779 read=453502 dirtied=1056 written=434
         ->  HashAggregate  (cost=2662998.86..2694479.09 rows=3148023 width=20) (actual time=136632.882..136710.417 rows=113113 loops=1)
               Buffers: shared hit=914773 read=453502 dirtied=1056 written=434
               ->  Hash Join  (cost=628699.10..2615778.51 rows=3148023 width=20) (actual time=38927.497..135676.108 rows=298462 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=914773 read=453502 dirtied=1056 written=434
                     ->  Seq Scan on lineitem  (cost=0.00..1833343.51 rows=32601512 width=12) (actual time=0.040..70649.123 rows=32414041 loops=1)
                           Filter: (l_shipdate > '1995-03-13'::date)
                           Rows Removed by Filter: 27630135
                           Buffers: shared hit=627438 read=448608 dirtied=804 written=421
                     ->  Hash  (cost=610412.97..610412.97 rows=1462890 width=12) (actual time=38923.374..38923.374 rows=1453166 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62441kB
                           Buffers: shared hit=287335 read=4894 dirtied=252 written=13
                           ->  Hash Join  (cost=49676.60..610412.97 rows=1462890 width=12) (actual time=2012.998..37926.579 rows=1453166 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=287335 read=4894 dirtied=252 written=13
                                 ->  Seq Scan on orders  (cost=0.00..445175.49 rows=7340508 width=16) (actual time=0.045..14860.532 rows=7284649 loops=1)
                                       Filter: (o_orderdate < '1995-03-13'::date)
                                       Rows Removed by Filter: 7730351
                                       Buffers: shared hit=253049 read=2752 dirtied=252 written=10
                                 ->  Hash  (cost=45939.91..45939.91 rows=298935 width=4) (actual time=2012.693..2012.693 rows=299751 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10539kB
                                       Buffers: shared hit=34286 read=2142 written=3
                                       ->  Bitmap Heap Scan on customer  (cost=6925.23..45939.91 rows=298935 width=4) (actual time=243.433..1847.064 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Buffers: shared hit=34286 read=2142 written=3
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6850.49 rows=298935 width=0) (actual time=230.907..230.907 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1153 written=3
 Total runtime: 136777.387 ms
(35 rows)

COMMIT;
COMMIT