BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'ARGENTINA' 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 = 'AMERICA' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'SMALL POLISHED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1702096.02..1702097.84 rows=728 width=38) (actual time=9246.009..9246.010 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=1806450 read=448825 dirtied=1202 -> HashAggregate (cost=1702048.68..1702061.42 rows=728 width=38) (actual time=9245.955..9245.956 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1806447 read=448825 dirtied=1202 -> Hash Join (cost=39439.28..1701572.96 rows=23786 width=38) (actual time=833.871..9210.929 rows=23888 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1806447 read=448825 dirtied=1202 -> Nested Loop (cost=39437.72..1701125.41 rows=23786 width=16) (actual time=833.812..9180.663 rows=23888 loops=1) Buffers: shared hit=1806443 read=448825 dirtied=1202 -> Hash Join (cost=39437.43..1693450.54 rows=23786 width=16) (actual time=833.787..9025.246 rows=23888 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1734658 read=448806 dirtied=1202 -> Nested Loop (cost=406.74..1653736.00 rows=118931 width=20) (actual time=6.029..8124.626 rows=119769 loops=1) Buffers: shared hit=1624821 read=412706 dirtied=1202 -> Nested Loop (cost=406.31..1461174.48 rows=393272 width=16) (actual time=5.978..3286.695 rows=393677 loops=1) Buffers: shared hit=209415 read=251324 dirtied=1202 -> Bitmap Heap Scan on part (cost=405.74..27799.20 rows=13073 width=4) (actual time=5.932..141.354 rows=13153 loops=1) Recheck Cond: ((p_type)::text = 'SMALL POLISHED COPPER'::text) Heap Blocks: exact=11252 Buffers: shared read=11334 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..402.48 rows=13073 width=0) (actual time=3.896..3.896 rows=13153 loops=1) Index Cond: ((p_type)::text = 'SMALL POLISHED COPPER'::text) Buffers: shared read=82 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..109.33 rows=31 width=20) (actual time=0.022..0.229 rows=30 loops=13153) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=209415 read=239990 dirtied=1202 -> Index Scan using pk_orders on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.012..0.012 rows=0 loops=393677) Index Cond: (o_orderkey = lineitem.l_orderkey) Filter: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Rows Removed by Filter: 1 Buffers: shared hit=1415406 read=161382 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=821.848..821.848 rows=299436 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14624kB Buffers: shared hit=109837 read=36100 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=17.157..730.884 rows=299436 loops=1) Buffers: shared hit=109837 read=36100 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.028..0.083 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=0.004..0.019 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.011..0.011 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=0.007..0.008 rows=1 loops=1) Filter: (r_name = 'AMERICA'::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=15.666..135.909 rows=59887 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145102 Buffers: shared hit=109835 read=36100 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=10.041..10.041 rows=59887 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=7 read=826 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.005..0.006 rows=1 loops=23888) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=71785 read=19 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.025..0.025 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: 6.765 ms Execution time: 9246.699 ms (68 rows) COMMIT; COMMIT