很久以前准备写的系列文章,后来因为懒一直耽搁着,今天突然决定继续下去,于是有了这篇文章,很基础,但很常用.题目描述依然拷贝.简单来说就是找出个个部门薪水排名第二的人,排名相同的要一起列出来. Introduction The challenge is to find the employees with the second highest salary in each department. However, it is a little more complicated because if…
和之前发布的TSQL Challenge 1是同一系列的文章,看到那篇学习哪篇,没有固定的顺序,只为锻炼下思维. Compare rows in the same table and group the data The challenge is to compare the data of the rows and group the input data. The data needs to be grouped based on the Product ID, Date, TotalLin…