Question

此查询选择以下内容：

SELECT jobs.JobID, school.School_Name, 
       CONCAT(staff.First_Name, ' ', staff.Last_Name) AS 'Full_Name', 
       staff.Phone_Number, role.Role
  FROM jobs
 INNER JOIN school ON jobs.SchoolID=school.SchoolID
 INNER JOIN staff ON jobs.StaffID=staff.staffID
 INNER JOIN role ON jobs.roleID=role.roleID
 ORDER BY staff.StaffID asc


JOB ID  FULL NAME   ROLE
------  ---------   ----------
1       BOB         PRINCIPLE
2       BOB         TEACHER
3       JACK        TEACHER
4       SARAH       ACCOUNTANT
5       SARAH       NURSE

但是，我希望结果看起来像：

BOB     PRINCIPLE, TEACHER
JACK    TEACHER
SARAH   ACCOUNTANT, NURSE

我对如何做到这一点感到困惑，因为通过添加GROUP BY子句，它仅选择了第一个JobID？

感谢您的任何帮助，谢谢。

Answer 1

您可以使用GROUP_CONCAT

SELECT Full_Name, GROUP_CONCAT(Role) AS Role
  FROM
 (
  SELECT jobs.JobID, school.School_Name, CONCAT(staff.First_Name, ' ', staff.Last_Name) 
     AS Full_Name, staff.Phone_Number, role.Role
    FROM jobs
   INNER JOIN school ON jobs.SchoolID=school.SchoolID
   INNER JOIN staff ON jobs.StaffID=staff.staffID
   INNER JOIN role ON jobs.roleID=role.roleID
   ORDER BY staff.StaffID asc
 ) q
GROUP BY Full_Name

在使用GROUP BY的情况下，针对具有多个层的用户的连接层？

1 个答案: