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 '1995-03-17'
	and l_shipdate > date '1995-03-17'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2669527.34..2669527.37 rows=10 width=20) (actual time=42982.849..42982.853 rows=10 loops=1)
   Buffers: shared hit=691240 read=666514
   ->  Sort  (cost=2669527.34..2677376.13 rows=3139513 width=20) (actual time=42982.844..42982.845 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=691240 read=666514
         ->  HashAggregate  (cost=2570288.47..2601683.60 rows=3139513 width=20) (actual time=42880.592..42960.959 rows=113899 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=691234 read=666514
               ->  Hash Join  (cost=551467.65..2523195.77 rows=3139513 width=20) (actual time=12261.384..42342.653 rows=300424 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=691234 read=666514
                     ->  Seq Scan on lineitem  (cost=0.00..1818868.36 rows=32390569 width=12) (actual time=0.033..21304.905 rows=32315744 loops=1)
                           Filter: (l_shipdate > '1995-03-17'::date)
                           Rows Removed by Filter: 27729859
                           Buffers: shared hit=402471 read=665075
                     ->  Hash  (cost=533257.57..533257.57 rows=1456806 width=12) (actual time=12247.949..12247.949 rows=1461747 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79194kB
                           Buffers: shared hit=288763 read=1439
                           ->  Hash Join  (cost=49728.90..533257.57 rows=1456806 width=12) (actual time=678.529..11489.728 rows=1461747 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=288763 read=1439
                                 ->  Seq Scan on orders  (cost=0.00..441649.60 rows=7282936 width=16) (actual time=0.037..6736.118 rows=7309579 loops=1)
                                       Filter: (o_orderdate < '1995-03-17'::date)
                                       Rows Removed by Filter: 7705421
                                       Buffers: shared hit=253488 read=287
                                 ->  Hash  (cost=45978.34..45978.34 rows=300045 width=4) (actual time=675.303..675.303 rows=300036 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14645kB
                                       Buffers: shared hit=35275 read=1152
                                       ->  Bitmap Heap Scan on customer  (cost=6949.78..45978.34 rows=300045 width=4) (actual time=110.777..550.307 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=35275 read=1152
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6874.76 rows=300045 width=0) (actual time=98.816..98.816 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1152
 Planning time: 5.407 ms
 Execution time: 43013.093 ms
(38 rows)

COMMIT;
COMMIT