Home Database Mysql Tutorial SQL Server数据库ROW_NUMBER()函数使用详解

SQL Server数据库ROW_NUMBER()函数使用详解

Jun 07, 2016 pm 05:40 PM
server use function database Detailed explanation

SQL Server数据库ROW_NUMBER()函数的使用是本文我们要介绍的内容,接下来我们就通过几个实例来一一介绍ROW_NUMBER()函数的使用。 实例如下: 1.使用row_number()函数进行编号,如 selectemail,customerID,ROW_NUMBER()over(orderbypsd)asrowsfromQT_Custom

SQL Server数据库ROW_NUMBER()函数的使用是本文我们要介绍的内容,接下来我们就通过几个实例来一一介绍ROW_NUMBER()函数的使用。

实例如下:

1.使用row_number()函数进行编号,如

select email,customerID, ROW_NUMBER() over(order by psd) as rows from QT_Customer

原理:先按psd进行排序,排序完后,给每条数据进行编号。

2.在订单中按价格的升序进行排序,并给每条记录进行排序代码如下:

select DID,customerID,totalPrice,ROW_NUMBER() over(order by totalPrice) as rows from OP_Order

3.统计出每一个各户的所有订单并按每一个客户下的订单的金额 升序排序,同时给每一个客户的订单进行编号。这样就知道每个客户下几单了。

如图:

SQL Server数据库ROW_NUMBER()使用详解

代码如下:

select ROW_NUMBER() over(partition by customerID  order by totalPrice) as rows,customerID,totalPrice, DID from OP_Order

4.统计每一个客户最近下的订单是第几次下的订单。

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