mysql - 检索 empoly 和 magers 列表

Question

我有 2 张表员工和部门

Table employee columns
empid
name
salary
location

Table department columns
deptno
deptname
empid
mangerid

现在我想检索带有名称的员工和经理列表。我试过了，但我无法找回

Answer 1

要为其添加一些亮点，您可以尝试以下操作：) 您可以按经理结果删除GROUP_CONCAT普通GROUP_BY员工。

参考：

SQLFIDDLE

样品表

电磁脉冲

ID  NAME
1   JOHN
2   JIM
3   KATE
4   TIM
5   JANE

部门

ID  EID     MID
11  2       1
12  3       2
12  4       1
12  5       2

查询GROUP_CONCAT

SELECT M.NAME AS Manager, GROUP_CONCAT(E.NAME,' ') AS Employee
FROM EMP E
JOIN DEPT D
ON E.ID = D.EID
JOIN EMP M
ON D.MID = M.ID
GROUP BY M.NAME

结果：

MANAGER     EMPLOYEE
JIM         KATE ,JANE
JOHN        TIM ,JIM 

GROUP_CONCAT不带and的查询GROUP_BY

SELECT M.NAME AS Manager, E.NAME AS Employee
FROM EMP E
JOIN DEPT D
ON E.ID = D.EID
JOIN EMP M
ON D.MID = M.ID

GROUP_CONCAT不带and的查询结果GROUP_BY

MANAGER     EMPLOYEE
JOHN        JIM
JOHN        TIM
JIM         KATE
JIM         JANE

Answer 2

尝试select emp1.name, emp2.name from employee emp1, employee emp2, department dept where emp1.empid=dept.empid and emp2.empid=dept.managerid