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。

select *，row_number () over (partition by column1 order by column2) as n from tablename 在上面语法中： PARTITION BY子句将结果集划分为分区。

The new column will create an incrementing integer which is basically a pointer to the row number of the results. To do this in MS SQL Server, add the following to the beginning of your column ...

When you use SELECT in a PL/SQL block, it’s important to make sure that exactly one row will always be returned by your query. If more than one row is returned, the TOO_MANY_ROWS exception occurs.