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 '1995-03-19'
	and l_shipdate > date '1995-03-19'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2682882.68..2682882.70 rows=10 width=20) (actual time=36866.262..36866.265 rows=10 loops=1)
   Buffers: shared hit=765500 read=598967 written=2112
   ->  Sort  (cost=2682882.68..2690775.46 rows=3157113 width=20) (actual time=36866.257..36866.259 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=765500 read=598967 written=2112
         ->  HashAggregate  (cost=2583087.47..2614658.60 rows=3157113 width=20) (actual time=36785.070..36844.688 rows=113931 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=765494 read=598967 written=2112
               ->  Hash Join  (cost=554074.18..2535730.77 rows=3157113 width=20) (actual time=9028.030..36492.457 rows=300566 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=765494 read=598967 written=2112
                     ->  Seq Scan on lineitem  (cost=0.00..1828148.88 rows=32516424 width=12) (actual time=0.034..19997.296 rows=32232107 loops=1)
                           Filter: (l_shipdate > '1995-03-19'::date)
                           Rows Removed by Filter: 27752802
                           Buffers: shared hit=530172 read=542821 written=1
                     ->  Hash  (cost=535741.89..535741.89 rows=1466583 width=12) (actual time=9011.740..9011.740 rows=1462918 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79244kB
                           Buffers: shared hit=235322 read=56146 written=2111
                           ->  Hash Join  (cost=49728.90..535741.89 rows=1466583 width=12) (actual time=845.482..8445.688 rows=1462918 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=235322 read=56146 written=2111
                                 ->  Seq Scan on orders  (cost=0.00..443852.85 rows=7331816 width=16) (actual time=0.027..5043.087 rows=7314888 loops=1)
                                       Filter: (o_orderdate < '1995-03-19'::date)
                                       Rows Removed by Filter: 7685112
                                       Buffers: shared hit=235320 read=19721 written=866
                                 ->  Hash  (cost=45978.34..45978.34 rows=300045 width=4) (actual time=841.320..841.320 rows=300036 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14645kB
                                       Buffers: shared hit=2 read=36425 written=1245
                                       ->  Bitmap Heap Scan on customer  (cost=6949.78..45978.34 rows=300045 width=4) (actual time=78.434..740.867 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=2 read=36425 written=1245
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6874.76 rows=300045 width=0) (actual time=68.747..68.747 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1152 written=2
 Planning time: 3.885 ms
 Execution time: 36903.095 ms
(38 rows)

COMMIT;
COMMIT