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 '1995-03-18'
	and l_shipdate > date '1995-03-18'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2747406.64..2747406.67 rows=10 width=20) (actual time=74030.350..74030.355 rows=10 loops=1)
   Buffers: shared hit=1108873 read=250197 written=3
   ->  Sort  (cost=2747406.64..2755321.36 rows=3165887 width=20) (actual time=74030.345..74030.346 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=1108873 read=250197 written=3
         ->  HashAggregate  (cost=2647334.09..2678992.96 rows=3165887 width=20) (actual time=73887.622..73996.603 rows=113189 loops=1)
               Buffers: shared hit=1108867 read=250197 written=3
               ->  Hash Join  (cost=626017.52..2599845.79 rows=3165887 width=20) (actual time=28545.320..73495.004 rows=299045 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=1108867 read=250197 written=3
                     ->  Seq Scan on lineitem  (cost=0.00..1820673.96 rows=32398783 width=12) (actual time=0.056..23324.999 rows=32290128 loops=1)
                           Filter: (l_shipdate > '1995-03-18'::date)
                           Rows Removed by Filter: 27755251
                           Buffers: shared hit=830933 read=237675
                     ->  Hash  (cost=607640.82..607640.82 rows=1470136 width=12) (actual time=28540.764..28540.764 rows=1459412 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62710kB
                           Buffers: shared hit=277934 read=12522 written=3
                           ->  Hash Join  (cost=49722.08..607640.82 rows=1470136 width=12) (actual time=1120.420..24813.468 rows=1459412 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=277934 read=12522 written=3
                                 ->  Seq Scan on orders  (cost=0.00..442089.90 rows=7354726 width=16) (actual time=0.019..6084.159 rows=7315809 loops=1)
                                       Filter: (o_orderdate < '1995-03-18'::date)
                                       Rows Removed by Filter: 7699191
                                       Buffers: shared hit=242842 read=11186 written=3
                                 ->  Hash  (cost=45974.14..45974.14 rows=299835 width=4) (actual time=1120.121..1120.121 rows=299751 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10539kB
                                       Buffers: shared hit=35092 read=1336
                                       ->  Bitmap Heap Scan on customer  (cost=6948.20..45974.14 rows=299835 width=4) (actual time=531.817..983.401 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Buffers: shared hit=35092 read=1336
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6873.24 rows=299835 width=0) (actual time=517.286..517.286 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1153
 Total runtime: 74080.930 ms
(35 rows)

COMMIT;
COMMIT