BEGIN;
BEGIN
EXPLAIN
select
	s_name,
	s_address
from
	supplier,
	nation
where
	s_suppkey in (
		select
			ps_suppkey
		from
			partsupp
		where
			ps_partkey in (
				select
					p_partkey
				from
					part
				where
					p_name like 'steel%'
			)
			and ps_availqty > (
				select
					0.5 * sum(l_quantity)
				from
					lineitem
				where
					l_partkey = ps_partkey
					and l_suppkey = ps_suppkey
					and l_shipdate >= '1994-01-01'
					and l_shipdate < cast(date '1994-01-01' + interval '1 year' as date)
			)
	)
	and s_nationkey = n_nationkey
	and n_name = 'VIETNAM'
order by
	s_name;
                                                                                           QUERY PLAN                                                                                           
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Nested Loop Semi Join  (cost=4119.79..2816124.78 rows=1071 width=52)
   ->  Gather Merge  (cost=4118.93..4574.81 rows=4000 width=56)
         Workers Planned: 1
         ->  Sort  (cost=3118.92..3124.80 rows=2353 width=56)
               Sort Key: supplier.s_name
               ->  Hash Join  (cost=1.32..2987.15 rows=2353 width=56)
                     Hash Cond: (supplier.s_nationkey = nation.n_nationkey)
                     ->  Parallel Seq Scan on supplier  (cost=0.00..2805.24 rows=58824 width=60)
                     ->  Hash  (cost=1.31..1.31 rows=1 width=4)
                           ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4)
                                 Filter: (n_name = 'VIETNAM'::bpchar)
   ->  Nested Loop  (cost=0.86..702.88 rows=1 width=4)
         ->  Index Scan using partsupp_ps_suppkey_idx on partsupp  (cost=0.43..689.45 rows=26 width=8)
               Index Cond: (ps_suppkey = supplier.s_suppkey)
               Filter: ((ps_availqty)::numeric > (SubPlan 1))
               SubPlan 1
                 ->  Aggregate  (cost=8.59..8.61 rows=1 width=32)
                       ->  Index Only Scan using lineitem_l_partkey_l_suppkey_l_shipdate_l_quantity_idx on lineitem  (cost=0.56..8.59 rows=1 width=5)
                             Index Cond: ((l_partkey = partsupp.ps_partkey) AND (l_suppkey = partsupp.ps_suppkey) AND (l_shipdate >= '1994-01-01'::date) AND (l_shipdate < '1995-01-01'::date))
         ->  Index Scan using pk_part on part  (cost=0.43..0.52 rows=1 width=4)
               Index Cond: (p_partkey = partsupp.ps_partkey)
               Filter: ((p_name)::text ~~ 'steel%'::text)
(22 rows)

COMMIT;
COMMIT