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 '1995-03-02'
	and l_shipdate > date '1995-03-02'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2668768.65..2668768.67 rows=10 width=20) (actual time=28383.959..28383.963 rows=10 loops=1)
   Buffers: shared hit=802568 read=553862
   ->  Sort  (cost=2668768.65..2676652.35 rows=3153479 width=20) (actual time=28383.953..28383.956 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=802568 read=553862
         ->  HashAggregate  (cost=2569088.31..2600623.10 rows=3153479 width=20) (actual time=28328.421..28364.911 rows=113125 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=802562 read=553862
               ->  Hash Join  (cost=550709.61..2521786.13 rows=3153479 width=20) (actual time=7096.419..28118.446 rows=298408 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=802562 read=553862
                     ->  Seq Scan on lineitem  (cost=0.00..1817047.86 rows=32665031 width=12) (actual time=0.028..16491.228 rows=32691598 loops=1)
                           Filter: (l_shipdate > '1995-03-02'::date)
                           Rows Removed by Filter: 27354071
                           Buffers: shared hit=513765 read=552710
                     ->  Hash  (cost=532590.30..532590.30 rows=1449545 width=12) (actual time=7088.558..7088.558 rows=1439365 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78232kB
                           Buffers: shared hit=288797 read=1152
                           ->  Hash Join  (cost=49751.80..532590.30 rows=1449545 width=12) (actual time=438.536..6677.148 rows=1439365 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=288797 read=1152
                                 ->  Seq Scan on orders  (cost=0.00..441209.30 rows=7235665 width=16) (actual time=0.016..4310.719 rows=7215287 loops=1)
                                       Filter: (o_orderdate < '1995-03-02'::date)
                                       Rows Removed by Filter: 7799713
                                       Buffers: shared hit=253522
                                 ->  Hash  (cost=45995.55..45995.55 rows=300500 width=4) (actual time=436.046..436.046 rows=299751 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14635kB
                                       Buffers: shared hit=35275 read=1152
                                       ->  Bitmap Heap Scan on customer  (cost=6961.30..45995.55 rows=300500 width=4) (actual time=66.951..362.513 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=35275 read=1152
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6886.18 rows=300500 width=0) (actual time=58.565..58.565 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1152
 Planning time: 5.514 ms
 Execution time: 28401.821 ms
(38 rows)

COMMIT;
COMMIT