CREATE TABLE table_name_30 (sub_parish__sogn_ VARCHAR(255), parish__prestegjeld_ VARCHAR(255), church_name VARCHAR(255))
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"