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 = 'AUTOMOBILE'
	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=2760844.52..2760844.54 rows=10 width=20) (actual time=78317.380..78317.385 rows=10 loops=1)
   Buffers: shared hit=659472 read=706175 written=7
   ->  Sort  (cost=2760844.52..2768802.03 rows=3183003 width=20) (actual time=78317.375..78317.377 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=659472 read=706175 written=7
         ->  HashAggregate  (cost=2660230.94..2692060.97 rows=3183003 width=20) (actual time=78217.272..78296.313 rows=113965 loops=1)
               Buffers: shared hit=659466 read=706175 written=7
               ->  Hash Join  (cost=627773.09..2612485.89 rows=3183003 width=20) (actual time=25022.639..77725.460 rows=300771 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=659466 read=706175 written=7
                     ->  Seq Scan on lineitem  (cost=0.00..1829719.94 rows=32843423 width=12) (actual time=0.110..30263.988 rows=32589469 loops=1)
                           Filter: (l_shipdate > '1995-03-06'::date)
                           Rows Removed by Filter: 27455195
                           Buffers: shared hit=405626 read=668292 written=7
                     ->  Hash  (cost=609456.26..609456.26 rows=1465346 width=12) (actual time=25020.858..25020.858 rows=1448083 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62223kB
                           Buffers: shared hit=253840 read=37883
                           ->  Hash Join  (cost=49723.39..609456.26 rows=1465346 width=12) (actual time=1153.990..24142.754 rows=1448083 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=253840 read=37883
                                 ->  Seq Scan on orders  (cost=0.00..444294.89 rows=7329784 width=16) (actual time=0.017..6512.005 rows=7240785 loops=1)
                                       Filter: (o_orderdate < '1995-03-06'::date)
                                       Rows Removed by Filter: 7774215
                                       Buffers: shared hit=253837 read=1458
                                 ->  Hash  (cost=45974.95..45974.95 rows=299875 width=4) (actual time=1153.769..1153.769 rows=300036 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10549kB
                                       Buffers: shared hit=3 read=36425
                                       ->  Bitmap Heap Scan on customer  (cost=6948.51..45974.95 rows=299875 width=4) (actual time=74.715..1000.654 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Buffers: shared hit=3 read=36425
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6873.54 rows=299875 width=0) (actual time=66.749..66.749 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1153
 Total runtime: 78354.608 ms
(35 rows)

COMMIT;
COMMIT