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 '1995-03-29'
	and l_shipdate > date '1995-03-29'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2774846.48..2774846.51 rows=10 width=20) (actual time=82570.864..82570.868 rows=10 loops=1)
   Buffers: shared hit=718677 read=654889 dirtied=507 written=6
   ->  Sort  (cost=2774846.48..2782787.45 rows=3176387 width=20) (actual time=82570.860..82570.863 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=718677 read=654889 dirtied=507 written=6
         ->  HashAggregate  (cost=2674442.03..2706205.90 rows=3176387 width=20) (actual time=82483.561..82551.704 rows=113063 loops=1)
               Buffers: shared hit=718671 read=654889 dirtied=507 written=6
               ->  Hash Join  (cost=632907.34..2626796.23 rows=3176387 width=20) (actual time=26272.619..81627.084 rows=298078 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=718671 read=654889 dirtied=507 written=6
                     ->  Seq Scan on lineitem  (cost=0.00..1840637.49 rows=32396673 width=12) (actual time=0.072..32042.556 rows=32014732 loops=1)
                           Filter: (l_shipdate > '1995-03-29'::date)
                           Rows Removed by Filter: 28030301
                           Buffers: shared hit=450955 read=629364 written=6
                     ->  Hash  (cost=614266.34..614266.34 rows=1491280 width=12) (actual time=26270.391..26270.391 rows=1472947 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 63291kB
                           Buffers: shared hit=267716 read=25525 dirtied=507
                           ->  Hash Join  (cost=49701.30..614266.34 rows=1491280 width=12) (actual time=686.821..24993.150 rows=1472947 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=267716 read=25525 dirtied=507
                                 ->  Seq Scan on orders  (cost=0.00..446936.69 rows=7470222 width=16) (actual time=0.022..7112.046 rows=7384275 loops=1)
                                       Filter: (o_orderdate < '1995-03-29'::date)
                                       Rows Removed by Filter: 7630725
                                       Buffers: shared hit=232443 read=24370 dirtied=507
                                 ->  Hash  (cost=45958.24..45958.24 rows=299445 width=4) (actual time=686.541..686.541 rows=299751 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10539kB
                                       Buffers: shared hit=35273 read=1155
                                       ->  Bitmap Heap Scan on customer  (cost=6937.18..45958.24 rows=299445 width=4) (actual time=118.049..548.218 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Buffers: shared hit=35273 read=1155
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6862.32 rows=299445 width=0) (actual time=105.676..105.676 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1153
 Total runtime: 82611.308 ms
(35 rows)

COMMIT;
COMMIT