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 '1995-03-31'
	and l_shipdate > date '1995-03-31'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2743525.12..2743525.15 rows=10 width=20) (actual time=79342.550..79342.556 rows=10 loops=1)
   Buffers: shared hit=989007 read=368748 dirtied=252 written=8
   ->  Sort  (cost=2743525.12..2751401.65 rows=3150609 width=20) (actual time=79342.545..79342.548 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=989007 read=368748 dirtied=252 written=8
         ->  HashAggregate  (cost=2643935.50..2675441.59 rows=3150609 width=20) (actual time=79236.294..79320.663 rows=113175 loops=1)
               Buffers: shared hit=989001 read=368748 dirtied=252 written=8
               ->  Hash Join  (cost=626428.84..2596676.37 rows=3150609 width=20) (actual time=27199.981..78774.600 rows=298465 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=989001 read=368748 dirtied=252 written=8
                     ->  Seq Scan on lineitem  (cost=0.00..1818867.75 rows=31966316 width=12) (actual time=0.053..28327.781 rows=31965617 loops=1)
                           Filter: (l_shipdate > '1995-03-31'::date)
                           Rows Removed by Filter: 28079986
                           Buffers: shared hit=773903 read=293643
                     ->  Hash  (cost=607911.87..607911.87 rows=1481358 width=12) (actual time=27195.503..27195.503 rows=1475483 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 63400kB
                           Buffers: shared hit=215098 read=75105 dirtied=252 written=8
                           ->  Hash Join  (cost=49749.40..607911.87 rows=1481358 width=12) (actual time=656.579..25755.407 rows=1475483 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=215098 read=75105 dirtied=252 written=8
                                 ->  Seq Scan on orders  (cost=0.00..441649.60 rows=7396312 width=16) (actual time=0.022..6843.492 rows=7396516 loops=1)
                                       Filter: (o_orderdate < '1995-03-31'::date)
                                       Rows Removed by Filter: 7618484
                                       Buffers: shared hit=179823 read=73952 dirtied=252 written=8
                                 ->  Hash  (cost=45994.09..45994.09 rows=300425 width=4) (actual time=656.319..656.319 rows=299751 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10539kB
                                       Buffers: shared hit=35275 read=1153
                                       ->  Bitmap Heap Scan on customer  (cost=6960.77..45994.09 rows=300425 width=4) (actual time=113.166..543.346 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Buffers: shared hit=35275 read=1153
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6885.67 rows=300425 width=0) (actual time=101.088..101.088 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1153
 Total runtime: 79406.639 ms
(35 rows)

COMMIT;
COMMIT