sql – 如何连接多行？

我有以下查询返回所有员工的薪水.这项工作完美但我需要收集额外的数据,我将聚合到一个单元格中(参见结果集2).

如何将数据聚合到逗号分隔列表中？有点像Sum所做的,但我需要一个字符串作为回报.

SELECT Employee.Id,SUM(Pay) as Salary
FROM Employee
INNER JOIN PayCheck ON PayCheck.EmployeeId = Employee.Id
GROUP BY Employee.Id

结果集1

Employee.Id              Salary
-----------------------------------
          1                 150
          2                 250
          3                 350

我需要：

结果集2

Employee.Id              Salary                 Data
----------------------------------------------------
          1                 150      One,Two,Three
          2                 250      Four,Five,Six
          3                 350      Seven

解决方法

对于sql Server 2005,请使用STUFF函数和FOR XML PATH：

WITH summary_cte AS (
   SELECT Employee.Id,SUM(Pay) as Salary
     FROM Employee
     JOIN PayCheck ON PayCheck.EmployeeId = Employee.Id
 GROUP BY Employee.Id)
SELECT sc.id,sc.salary,STUFF((SELECT ','+ yt.data
                FROM your_table yt
               WHERE yt.id = sc.id
            GROUP BY yt.data
             FOR XML PATH(''),TYPE).value('.','VARCHAR(max)'),1,'')
  FROM summary_cte sc

但是,您缺少有关要将数据转换为逗号分隔字符串的位置的详细信息,以及它与员工记录的关系…

原文地址：https://www.jb51.cc/mssql/83397.html