mysql insert插入新形式，再也不需要拼接多重insert啦

注意一下，不能省略表中的任何字段.包括自增id.而且字段的顺序必须和插入表一致

原理是“表插表”

INSERT INTO prod_attr
select A.* from
(
        SELECT
                                       AS prod_id,
                                       AS attr_id,
                    '中国出版社'         AS attr_value

        UNION

        SELECT
                                       AS prod_id,
                                       AS attr_id,
                    '清华出版社'         AS attr_value
) AS A

表结构