SQL学习笔记：选取第N条记录

Northwind数据库，选取价格第二高的产品。

有两种方法，一个是用Row_Number()函数：

SELECT productname FROM 
    (SELECT TOP 2 productname, Row_Number() OVER (ORDER BY unitprice desc) AS rownum
     FROM Products) AS tbl
WHERE rownum = 2;

另外一种是对子语句的的结果再进行排序：

SELECT top 1 productname FROM 
    (SELECT TOP 2 productname,unitprice 
     FROM Products order by unitprice desc) AS tbl
order by tbl.unitprice asc