duplication hint:
error hint:
- QUERY PLAN
--------------------------------------------
+ QUERY PLAN
+---------------------------------------------
Nested Loop
-> Seq Scan on tm1 t1
- -> Index Scan using tm1_pkey on tm1 t2
+ -> Index Scan using tm1_c1_idx on tm1 t2
Index Cond: (c1 = t1.c1)
(4 rows)