The first field you group on is the first and most significant group level; the second field you group on is the next group level; and so on.

 
  • 作为分组依据的第一个字段是第一个也是最重要的分组级别,第二个分组依据字段是下一个分组级别,依此类推。
今日热词
目录 附录 查词历史