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 '1995-03-06'
	and l_shipdate > date '1995-03-06'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2667616.34..2667616.37 rows=10 width=20) (actual time=29980.248..29980.250 rows=10 loops=1)
   Buffers: shared hit=802183 read=554247
   ->  Sort  (cost=2667616.34..2675462.33 rows=3138395 width=20) (actual time=29980.244..29980.245 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=802183 read=554247
         ->  HashAggregate  (cost=2568412.80..2599796.75 rows=3138395 width=20) (actual time=29924.986..29961.048 rows=113082 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=802177 read=554247
               ->  Hash Join  (cost=550537.48..2521336.88 rows=3138395 width=20) (actual time=7684.800..29718.347 rows=298527 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=802177 read=554247
                     ->  Seq Scan on lineitem  (cost=0.00..1817047.41 rows=32631478 width=12) (actual time=0.026..17472.484 rows=32591374 loops=1)
                           Filter: (l_shipdate > '1995-03-06'::date)
                           Rows Removed by Filter: 27454295
                           Buffers: shared hit=513380 read=553095
                     ->  Hash  (cost=532486.29..532486.29 rows=1444095 width=12) (actual time=7677.010..7677.010 rows=1444328 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78445kB
                           Buffers: shared hit=288797 read=1152
                           ->  Hash Join  (cost=49696.83..532486.29 rows=1444095 width=12) (actual time=434.954..7256.974 rows=1444328 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=288797 read=1152
                                 ->  Seq Scan on orders  (cost=0.00..441209.30 rows=7237122 width=16) (actual time=0.018..4884.109 rows=7240482 loops=1)
                                       Filter: (o_orderdate < '1995-03-06'::date)
                                       Rows Removed by Filter: 7774518
                                       Buffers: shared hit=253522
                                 ->  Hash  (cost=45955.46..45955.46 rows=299310 width=4) (actual time=432.533..432.533 rows=299751 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14635kB
                                       Buffers: shared hit=35275 read=1152
                                       ->  Bitmap Heap Scan on customer  (cost=6936.08..45955.46 rows=299310 width=4) (actual time=67.026..358.390 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=35275 read=1152
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6861.25 rows=299310 width=0) (actual time=58.637..58.637 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1152
 Planning time: 5.299 ms
 Execution time: 30003.376 ms
(38 rows)

COMMIT;
COMMIT