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 '1995-03-01'
	and l_shipdate > date '1995-03-01'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2681560.90..2681560.92 rows=10 width=20) (actual time=37466.900..37466.902 rows=10 loops=1)
   Buffers: shared hit=745991 read=618339 written=42
   ->  Sort  (cost=2681560.90..2689386.90 rows=3130403 width=20) (actual time=37466.896..37466.896 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=745991 read=618339 written=42
         ->  HashAggregate  (cost=2582609.98..2613914.01 rows=3130403 width=20) (actual time=37371.513..37445.554 rows=113101 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=745985 read=618339 written=42
               ->  Hash Join  (cost=552850.92..2535653.94 rows=3130403 width=20) (actual time=9676.480..37084.810 rows=298295 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=745985 read=618339 written=42
                     ->  Seq Scan on lineitem  (cost=0.00..1827915.45 rows=32955611 width=12) (actual time=0.039..20643.093 rows=32715887 loops=1)
                           Filter: (l_shipdate > '1995-03-01'::date)
                           Rows Removed by Filter: 27329423
                           Buffers: shared hit=588762 read=484094
                     ->  Hash  (cost=534915.97..534915.97 rows=1434796 width=12) (actual time=9667.448..9667.448 rows=1438173 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78181kB
                           Buffers: shared hit=157223 read=134245 written=42
                           ->  Hash Join  (cost=49634.91..534915.97 rows=1434796 width=12) (actual time=899.624..9130.796 rows=1438173 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=157223 read=134245 written=42
                                 ->  Seq Scan on orders  (cost=0.00..443852.85 rows=7221399 width=16) (actual time=0.043..5622.646 rows=7209069 loops=1)
                                       Filter: (o_orderdate < '1995-03-01'::date)
                                       Rows Removed by Filter: 7805931
                                       Buffers: shared hit=157221 read=97820 written=26
                                 ->  Hash  (cost=45909.54..45909.54 rows=298030 width=4) (actual time=896.838..896.838 rows=299751 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14635kB
                                       Buffers: shared hit=2 read=36425 written=16
                                       ->  Bitmap Heap Scan on customer  (cost=6906.16..45909.54 rows=298030 width=4) (actual time=87.089..796.887 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=2 read=36425 written=16
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6831.65 rows=298030 width=0) (actual time=77.366..77.366 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1152 written=1
 Planning time: 4.226 ms
 Execution time: 37490.343 ms
(38 rows)

COMMIT;
COMMIT