QUERY PLAN
Group (cost=2.42..2.42 rows=1 width=790)
Group Key: ps.id
-> Sort (cost=2.42..2.42 rows=1 width=790)
Sort Key: ps.id
-> Hash Right Join (cost=1.07..2.41 rows=1 width=790)
Hash Cond: (psrr.punch_strategy_id = ps.id)
Filter: (psrr.user_id IS NULL)
-> Seq Scan on tbl_punch_strategy_resource_rels psrr (cost=0.00..1.26 rows=26 width=8)
-> Hash (cost=1.03..1.03 rows=3 width=790)
-> Seq Scan on tbl_punch_strategies ps (cost=0.00..1.03 rows=3 width=790)