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 '1995-03-30'
	and l_shipdate > date '1995-03-30'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2760580.62..2760580.65 rows=10 width=20) (actual time=93932.362..93932.368 rows=10 loops=1)
   Buffers: shared hit=583188 read=782459 written=23
   ->  Sort  (cost=2760580.62..2768537.39 rows=3182707 width=20) (actual time=93932.357..93932.361 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=583188 read=782459 written=23
         ->  HashAggregate  (cost=2659976.40..2691803.47 rows=3182707 width=20) (actual time=93811.424..93900.666 rows=113537 loops=1)
               Buffers: shared hit=583182 read=782459 written=23
               ->  Hash Join  (cost=629951.02..2612235.79 rows=3182707 width=20) (actual time=25678.217..93200.042 rows=299783 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=583182 read=782459 written=23
                     ->  Seq Scan on lineitem  (cost=0.00..1829724.77 rows=32195449 width=12) (actual time=0.045..40532.003 rows=31989184 loops=1)
                           Filter: (l_shipdate > '1995-03-30'::date)
                           Rows Removed by Filter: 28055480
                           Buffers: shared hit=292929 read=780989 written=2
                     ->  Hash  (cost=611267.28..611267.28 rows=1494699 width=12) (actual time=25675.439..25675.439 rows=1478008 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 63509kB
                           Buffers: shared hit=290253 read=1470 written=21
                           ->  Hash Join  (cost=49803.23..611267.28 rows=1494699 width=12) (actual time=628.778..24361.812 rows=1478008 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=290253 read=1470 written=21
                                 ->  Seq Scan on orders  (cost=0.00..444294.89 rows=7434340 width=16) (actual time=0.019..7039.358 rows=7390475 loops=1)
                                       Filter: (o_orderdate < '1995-03-30'::date)
                                       Rows Removed by Filter: 7624525
                                       Buffers: shared hit=254976 read=319 written=21
                                 ->  Hash  (cost=46033.48..46033.48 rows=301580 width=4) (actual time=628.473..628.473 rows=300036 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10549kB
                                       Buffers: shared hit=35277 read=1151
                                       ->  Bitmap Heap Scan on customer  (cost=6985.73..46033.48 rows=301580 width=4) (actual time=122.797..525.294 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Buffers: shared hit=35277 read=1151
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6910.33 rows=301580 width=0) (actual time=111.136..111.136 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared hit=2 read=1151
 Total runtime: 93976.835 ms
(35 rows)

COMMIT;
COMMIT