QUERY PLAN                               
-----------------------------------------------------------------------
 Hash Join  (cost=xxx rows=1100 width=88)
   Hash Cond: (t1.c1 = t2.c1)
   ->  Seq Scan on tm1 t1  (cost=xxx rows=1100 width=44)
   ->  Hash  (cost=xxx rows=1100 width=44)
         ->  Seq Scan on tm1 t2  (cost=xxx rows=1100 width=44)
(5 rows)

                              QUERY PLAN                               
-----------------------------------------------------------------------
 Hash Join  (cost=xxx rows=1 width=88)
   Hash Cond: (t1.c1 = t2.c1)
   ->  Seq Scan on tm1 t1  (cost=xxx rows=1100 width=44)
   ->  Hash  (cost=xxx rows=1100 width=44)
         ->  Seq Scan on tm1 t2  (cost=xxx rows=1100 width=44)
(5 rows)