Query: rds_db_subnet_groups_for_rds_db_cluster

select
  g.arn as db_subnet_group_arn
from
  aws_rds_db_cluster as c,
  aws_rds_db_subnet_group g
where
  c.db_subnet_group = g.name
  and c.region = g.region
  and c.account_id = g.account_id
  and c.arn = $1;