1. 老师，帮我分析一下这两条语句的作用？和区别？（我想在查询blog表信息的时候，要将user表和type表的信息一起查出来，我该怎样设计SQL语句）

2. 我希望老师除了帮我分析这两条SQL语句之外，还能帮我设计出一条更合适的SQL语句？
   

<!--获取全部博客-->
<select id="queryBlogs" resultMap="blog">
    SELECT
        b.blog_id,
        b.title,
        b.content,
        b.first_picture,
        b.flag,
        b.views,
        b.appreciation,
        b.share_statement,
        b.comment_status,
        b.published,
        b.recommend,
        b.create_time,
        b.last_edit_time,
        u.user_id,
        u.nick_name,
        t.type_id,
        t.type_name
    FROM
        t_blog b,
        t_user u,
        t_type t
    <where>
        b.user_id = u.user_id
        AND
        b.type_id = t.type_id
    </where>
    ORDER BY
        b.last_edit_time DESC
</select>

<!--获取全部博客-->
<select id="queryBlogs" resultMap="blog">
    SELECT
        b.blog_id,
        b.title,
        b.content,
        b.first_picture,
        b.flag,
        b.views,
        b.appreciation,
        b.share_statement,
        b.comment_status,
        b.published,
        b.recommend,
        b.create_time,
        b.last_edit_time,
        u.user_id,
        u.nick_name,
        t.type_id,
        t.type_name
    FROM
        t_blog b
    INNER JOIN
        t_user u ON (u.user_id = b.user_id)
    INNER JOIN
        t_type t ON (t.type_id = b.type_id)
    ORDER BY
        b.last_edit_time DESC
</select>