mysql：group_concat / find_in_set / mysql实现oracle树查询 、 oracle 树操作

mysql：group_concat

http://www.cnblogs.com/wenxinphp/p/5841430.html

mysql：find_in_set

http://www.cnblogs.com/manongxiaobing/p/4682698.html

oracle：树操作

http://www.cnblogs.com/linjiqin/archive/2013/06/24/3152674.html

http://www.cnblogs.com/chen1388/archive/2010/09/25/1834827.html

http://www.cnblogs.com/quanweiru/archive/2012/11/18/2775843.html

http://blog.csdn.net/nimeijian/article/details/50231851

mysql实现oracle树查询：

http://blog.csdn.net/liwenbluesky/article/details/43307887