29.當用 SQL 查詢兩表格 A 與 B，哪個查詢方式會將條件的空值(Null)去除？ (A) SELECT * FROM A INNER JOIN B ON A.id = [B]id (B) SELECT * FROM A LEFT JOIN B ON A.id = [B]id (C) SELECT * FROM A RIGHT JOIN B ON A.id = [B]id (D) SELECT * FROM A, B