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 '1995-03-07'
	and l_shipdate > date '1995-03-07'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2738413.48..2738413.51 rows=10 width=20) (actual time=112764.930..112764.934 rows=10 loops=1)
   Buffers: shared hit=1018691 read=337740 dirtied=254 written=596
   ->  Sort  (cost=2738413.48..2746216.17 rows=3121074 width=20) (actual time=112764.927..112764.928 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=1018691 read=337740 dirtied=254 written=596
         ->  HashAggregate  (cost=2639757.45..2670968.19 rows=3121074 width=20) (actual time=112680.416..112746.688 rows=113038 loops=1)
               Buffers: shared hit=1018685 read=337740 dirtied=254 written=596
               ->  Hash Join  (cost=622858.86..2592941.34 rows=3121074 width=20) (actual time=32501.411..112062.218 rows=298612 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=1018685 read=337740 dirtied=254 written=596
                     ->  Seq Scan on lineitem  (cost=0.00..1817036.65 rows=32489358 width=12) (actual time=0.065..56779.292 rows=32533369 loops=1)
                           Filter: (l_shipdate > '1995-03-07'::date)
                           Rows Removed by Filter: 27451960
                           Buffers: shared hit=756247 read=310228 written=5
                     ->  Hash  (cost=604828.77..604828.77 rows=1442407 width=12) (actual time=32498.810..32498.810 rows=1444110 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62052kB
                           Buffers: shared hit=262438 read=27512 dirtied=254 written=591
                           ->  Hash Join  (cost=49676.60..604828.77 rows=1442407 width=12) (actual time=1951.178..31572.733 rows=1444110 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=262438 read=27512 dirtied=254 written=591
                                 ->  Seq Scan on orders  (cost=0.00..441209.30 rows=7237731 width=16) (actual time=0.019..11842.771 rows=7239643 loops=1)
                                       Filter: (o_orderdate < '1995-03-07'::date)
                                       Rows Removed by Filter: 7760357
                                       Buffers: shared hit=231561 read=21961 dirtied=254 written=591
                                 ->  Hash  (cost=45939.91..45939.91 rows=298935 width=4) (actual time=1950.925..1950.925 rows=299751 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10539kB
                                       Buffers: shared hit=30877 read=5551
                                       ->  Bitmap Heap Scan on customer  (cost=6925.23..45939.91 rows=298935 width=4) (actual time=281.351..1780.714 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Buffers: shared hit=30877 read=5551
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6850.49 rows=298935 width=0) (actual time=266.353..266.353 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1153
 Total runtime: 112796.656 ms
(35 rows)

COMMIT;
COMMIT