sql查询语句for xml path语法

【原地址】

for xml path作用：将多行的查询结果，根据某一些条件合并到一行。

例：现有一张表

执行下面语句

  select Department,
        (SELECT Employee+',' FROM People b WHERE b.Department=a.Department For XML Path(''))  Student 
  from People as a
  group by Department

得如下结果