Schema: CREATE TABLE table_name_30 (sub_parish__sogn_ VARCHAR, parish__prestegjeld_ VARCHAR, church_name VARCHAR)
Question: Which Sub-Parish (Sogn) is in the Parish (Prestegjeld) of hafslo parish and has a church called Hafslo Kyrkje?
SQL: SELECT sub_parish__sogn_ FROM table_name_30 WHERE parish__prestegjeld_ = "hafslo parish" AND church_name = "hafslo kyrkje"