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 '1995-03-18'
	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=2745696.40..2745696.42 rows=10 width=20) (actual time=84622.503..84622.507 rows=10 loops=1)
   Buffers: shared hit=856068 read=503002
   ->  Sort  (cost=2745696.40..2753568.99 rows=3149037 width=20) (actual time=84622.499..84622.500 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=856068 read=503002
         ->  HashAggregate  (cost=2646156.47..2677646.84 rows=3149037 width=20) (actual time=84501.166..84591.675 rows=113920 loops=1)
               Buffers: shared hit=856062 read=503002
               ->  Hash Join  (cost=625440.57..2598920.92 rows=3149037 width=20) (actual time=27059.058..83892.995 rows=300511 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=856062 read=503002
                     ->  Seq Scan on lineitem  (cost=0.00..1820677.18 rows=32350081 width=12) (actual time=0.048..31325.172 rows=32290128 loops=1)
                           Filter: (l_shipdate > '1995-03-18'::date)
                           Rows Removed by Filter: 27755251
                           Buffers: shared hit=574556 read=494052
                     ->  Hash  (cost=607134.16..607134.16 rows=1464513 width=12) (actual time=27057.133..27057.133 rows=1463012 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62864kB
                           Buffers: shared hit=281506 read=8950
                           ->  Hash Join  (cost=49728.95..607134.16 rows=1464513 width=12) (actual time=716.334..26170.853 rows=1463012 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=281506 read=8950
                                 ->  Seq Scan on orders  (cost=0.00..442089.90 rows=7321467 width=16) (actual time=0.012..6736.955 rows=7315809 loops=1)
                                       Filter: (o_orderdate < '1995-03-18'::date)
                                       Rows Removed by Filter: 7699191
                                       Buffers: shared hit=252760 read=1268
                                 ->  Hash  (cost=45978.39..45978.39 rows=300045 width=4) (actual time=716.112..716.112 rows=300036 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10549kB
                                       Buffers: shared hit=28746 read=7682
                                       ->  Bitmap Heap Scan on customer  (cost=6949.83..45978.39 rows=300045 width=4) (actual time=72.040..580.338 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Buffers: shared hit=28746 read=7682
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6874.82 rows=300045 width=0) (actual time=62.735..62.735 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1153
 Total runtime: 84677.564 ms
(35 rows)

COMMIT;
COMMIT