BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'FRANCE' then volume else 0 end) / sum(volume) as mkt_share from ( select extract(year from o_orderdate) as o_year, l_extendedprice * (1 - l_discount) as volume, n2.n_name as nation from part, supplier, lineitem, orders, customer, nation n1, nation n2, region where p_partkey = l_partkey and s_suppkey = l_suppkey and l_orderkey = o_orderkey and o_custkey = c_custkey and c_nationkey = n1.n_nationkey and n1.n_regionkey = r_regionkey and r_name = 'EUROPE' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'ECONOMY BURNISHED BRASS' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1757135.72..1757137.55 rows=733 width=38) (actual time=8774.410..8774.411 rows=2 loops=1) Sort Key: (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone)) Sort Method: quicksort Memory: 25kB Buffers: shared hit=1824526 read=210813 dirtied=866 -> HashAggregate (cost=1757088.01..1757100.83 rows=733 width=38) (actual time=8774.356..8774.357 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1824523 read=210813 dirtied=866 -> Hash Join (cost=39455.16..1756590.51 rows=24875 width=38) (actual time=739.181..8738.526 rows=24602 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1824523 read=210813 dirtied=866 -> Nested Loop (cost=39453.60..1756122.54 rows=24875 width=16) (actual time=739.119..8707.819 rows=24602 loops=1) Buffers: shared hit=1824519 read=210813 dirtied=866 -> Hash Join (cost=39453.30..1748096.29 rows=24875 width=16) (actual time=739.098..8516.346 rows=24602 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1750607 read=210813 dirtied=866 -> Nested Loop (cost=422.62..1708350.45 rows=124377 width=20) (actual time=7.162..7710.634 rows=123096 loops=1) Buffers: shared hit=1605263 read=209981 dirtied=866 -> Nested Loop (cost=422.18..1508223.84 rows=408720 width=16) (actual time=6.794..3446.212 rows=405484 loops=1) Buffers: shared hit=308417 read=165812 dirtied=757 -> Bitmap Heap Scan on part (cost=421.62..28413.37 rows=13573 width=4) (actual time=6.732..171.670 rows=13476 loops=1) Recheck Cond: ((p_type)::text = 'ECONOMY BURNISHED BRASS'::text) Heap Blocks: exact=11540 Buffers: shared hit=48 read=11576 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..418.23 rows=13573 width=0) (actual time=4.565..4.565 rows=13476 loops=1) Index Cond: ((p_type)::text = 'ECONOMY BURNISHED BRASS'::text) Buffers: shared read=84 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..108.72 rows=31 width=20) (actual time=0.025..0.233 rows=30 loops=13476) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=308369 read=154236 dirtied=757 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.010..0.010 rows=0 loops=405484) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1296846 read=44169 dirtied=109 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=728.345..728.345 rows=300963 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14677kB Buffers: shared hit=145344 read=832 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=18.476..646.247 rows=300963 loops=1) Buffers: shared hit=145344 read=832 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.042..0.080 rows=5 loops=1) Hash Cond: (n1.n_regionkey = region.r_regionkey) Buffers: shared hit=2 -> Seq Scan on nation n1 (cost=0.00..1.25 rows=25 width=8) (actual time=0.007..0.024 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.017..0.017 rows=1 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 9kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.012..0.013 rows=1 loops=1) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.11..6455.64 rows=60000 width=8) (actual time=16.805..119.351 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145336 Buffers: shared hit=145342 read=832 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=10.935..10.935 rows=60193 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=6 read=832 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.006..0.007 rows=1 loops=24602) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73912 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.020..0.020 rows=25 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 10kB Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.25 rows=25 width=30) (actual time=0.005..0.007 rows=25 loops=1) Buffers: shared hit=1 Planning time: 6.731 ms Execution time: 8775.196 ms (66 rows) COMMIT; COMMIT