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 '1995-03-20'
	and l_shipdate > date '1995-03-20'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2759197.00..2759197.03 rows=10 width=20) (actual time=82619.798..82619.804 rows=10 loops=1)
   Buffers: shared hit=751326 read=614321
   ->  Sort  (cost=2759197.00..2767110.49 rows=3165397 width=20) (actual time=82619.795..82619.799 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=751326 read=614321
         ->  HashAggregate  (cost=2659139.94..2690793.91 rows=3165397 width=20) (actual time=82491.965..82586.722 rows=113822 loops=1)
               Buffers: shared hit=751320 read=614321
               ->  Hash Join  (cost=628586.21..2611658.98 rows=3165397 width=20) (actual time=28282.649..81996.829 rows=300123 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=751320 read=614321
                     ->  Seq Scan on lineitem  (cost=0.00..1829724.26 rows=32451879 width=12) (actual time=0.041..31221.223 rows=32206498 loops=1)
                           Filter: (l_shipdate > '1995-03-20'::date)
                           Rows Removed by Filter: 27778021
                           Buffers: shared hit=460751 read=613167
                     ->  Hash  (cost=610150.92..610150.92 rows=1474823 width=12) (actual time=28280.706..28280.706 rows=1464139 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62913kB
                           Buffers: shared hit=290569 read=1154
                           ->  Hash Join  (cost=49728.95..610150.92 rows=1474823 width=12) (actual time=961.035..27381.053 rows=1464139 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=290569 read=1154
                                 ->  Seq Scan on orders  (cost=0.00..444294.89 rows=7373007 width=16) (actual time=0.016..7030.247 rows=7321210 loops=1)
                                       Filter: (o_orderdate < '1995-03-20'::date)
                                       Rows Removed by Filter: 7678790
                                       Buffers: shared hit=255292 read=3
                                 ->  Hash  (cost=45978.39..45978.39 rows=300045 width=4) (actual time=960.803..960.803 rows=300036 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10549kB
                                       Buffers: shared hit=35277 read=1151
                                       ->  Bitmap Heap Scan on customer  (cost=6949.83..45978.39 rows=300045 width=4) (actual time=73.924..453.330 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..6874.82 rows=300045 width=0) (actual time=64.526..64.526 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared hit=3 read=1150
 Total runtime: 82663.165 ms
(35 rows)

COMMIT;
COMMIT