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 = 'HOUSEHOLD'
	and c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate < date '1995-03-05'
	and l_shipdate > date '1995-03-05'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2758912.01..2758912.04 rows=10 width=20) (actual time=87112.478..87112.484 rows=10 loops=1)
   Buffers: shared hit=1128690 read=236957 written=7
   ->  Sort  (cost=2758912.01..2766824.89 rows=3165152 width=20) (actual time=87112.475..87112.478 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=1128690 read=236957 written=7
         ->  HashAggregate  (cost=2658862.70..2690514.22 rows=3165152 width=20) (actual time=87009.327..87090.198 rows=113061 loops=1)
               Buffers: shared hit=1128684 read=236957 written=7
               ->  Hash Join  (cost=626945.54..2611385.42 rows=3165152 width=20) (actual time=27866.855..86496.178 rows=298601 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=1128684 read=236957 written=7
                     ->  Seq Scan on lineitem  (cost=0.00..1829724.77 rows=32816956 width=12) (actual time=0.066..34527.903 rows=32614421 loops=1)
                           Filter: (l_shipdate > '1995-03-05'::date)
                           Rows Removed by Filter: 27430243
                           Buffers: shared hit=862236 read=211682 written=7
                     ->  Hash  (cost=608716.75..608716.75 rows=1458303 width=12) (actual time=27864.426..27864.426 rows=1443190 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62013kB
                           Buffers: shared hit=266448 read=25275
                           ->  Hash Join  (cost=49752.35..608716.75 rows=1458303 width=12) (actual time=1155.812..26331.955 rows=1443190 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=266448 read=25275
                                 ->  Seq Scan on orders  (cost=0.00..444294.89 rows=7279017 width=16) (actual time=0.037..7344.356 rows=7234529 loops=1)
                                       Filter: (o_orderdate < '1995-03-05'::date)
                                       Rows Removed by Filter: 7780471
                                       Buffers: shared hit=255245 read=50
                                 ->  Hash  (cost=45995.91..45995.91 rows=300515 width=4) (actual time=1155.520..1155.520 rows=299751 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10539kB
                                       Buffers: shared hit=11203 read=25225
                                       ->  Bitmap Heap Scan on customer  (cost=6961.47..45995.91 rows=300515 width=4) (actual time=135.572..1003.509 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Buffers: shared hit=11203 read=25225
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6886.34 rows=300515 width=0) (actual time=123.155..123.155 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1153
 Total runtime: 87153.896 ms
(35 rows)

COMMIT;
COMMIT