QUERY PLAN                             
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 Hash Join  (cost=73.64..76.50 rows=6 width=8)
   Hash Cond: (tab2.k = tab1.j)
   ->  HashAggregate  (cost=36.75..38.75 rows=200 width=4)
         ->  Seq Scan on tab2  (cost=0.00..31.40 rows=2140 width=4)
   ->  Hash  (cost=36.75..36.75 rows=11 width=8)
         ->  Seq Scan on tab1  (cost=0.00..36.75 rows=11 width=8)
               Filter: (j = i)
(7 rows)