InterView common question

1. 接口和抽象类的区别

http://kb.cnblogs.com/page/42159/

2. DataSet和DataReader的区别

http://www.cnblogs.com/jiahaohk/articles/1546864.html

3.索引

http://www.2cto.com/database/201105/91731.html

http://kb.cnblogs.com/page/44125/

4. sql: 行转列，递归，删除重复行，group by having, left righ inner, 分页

Posted in Techenology collection

5. Sort

http://blog.csdn.net/xiazdong/article/details/7304239

http://blog.csdn.net/xiazdong/article/details/8462393