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 '1995-03-25'
	and l_shipdate > date '1995-03-25'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2688859.31..2688859.33 rows=10 width=20) (actual time=42677.980..42677.986 rows=10 loops=1)
   Buffers: shared hit=830897 read=537383 written=176
   ->  Sort  (cost=2688859.31..2696728.51 rows=3147683 width=20) (actual time=42677.976..42677.978 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=830897 read=537383 written=176
         ->  HashAggregate  (cost=2589362.18..2620839.01 rows=3147683 width=20) (actual time=42603.691..42655.854 rows=113116 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=830891 read=537383 written=176
               ->  Hash Join  (cost=555591.86..2542146.93 rows=3147683 width=20) (actual time=14103.795..42289.893 rows=298389 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=830891 read=537383 written=176
                     ->  Seq Scan on lineitem  (cost=0.00..1833350.52 rows=32460724 width=12) (actual time=0.019..20269.719 rows=32113916 loops=1)
                           Filter: (l_shipdate > '1995-03-25'::date)
                           Rows Removed by Filter: 27930260
                           Buffers: shared hit=623027 read=453019 written=4
                     ->  Hash  (cost=537228.41..537228.41 rows=1469076 width=12) (actual time=14093.843..14093.843 rows=1468073 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79466kB
                           Buffers: shared hit=207864 read=84364 written=172
                           ->  Hash Join  (cost=49634.91..537228.41 rows=1469076 width=12) (actual time=522.786..13209.056 rows=1468073 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=207864 read=84364 written=172
                                 ->  Seq Scan on orders  (cost=0.00..445175.49 rows=7393935 width=16) (actual time=0.029..7104.385 rows=7359642 loops=1)
                                       Filter: (o_orderdate < '1995-03-25'::date)
                                       Rows Removed by Filter: 7655358
                                       Buffers: shared hit=172589 read=83212 written=171
                                 ->  Hash  (cost=45909.54..45909.54 rows=298030 width=4) (actual time=520.295..520.295 rows=299751 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14635kB
                                       Buffers: shared hit=35275 read=1152 written=1
                                       ->  Bitmap Heap Scan on customer  (cost=6906.16..45909.54 rows=298030 width=4) (actual time=76.371..434.054 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=35275 read=1152 written=1
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6831.65 rows=298030 width=0) (actual time=66.986..66.986 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1152 written=1
 Planning time: 3.952 ms
 Execution time: 42701.215 ms
(38 rows)

COMMIT;
COMMIT