Question

我遇到这么多麻烦，任何帮助都会很棒。

我在Oracle 10中有一个简单的表，看起来像这样

Name | EmployeeID |  ManagerID | Title

我需要一个查询来返回给定员工ID的所有报告

因此，如果我将员工ID传递给1000，它将循环直接报告，然后是间接报告等。

我弄乱了递归样本，但似乎没有一个对我有效。我知道我只是没有正确设置它。谢谢你的帮助。

FYI。我正在寻找一个SQL查询。

Answer 1

这样的事情应该有效：

select lpad(' ', 2*(level-1)) || name as employeename
from employee_table
start with employeeid = 1000
connect by prior employeeid = managerid;

lpad（）函数用于缩进结果，以便您可以查看谁向谁报告。

如果您不希望在结果中包含employeeid 1000，只需更改：

start with employeeid = 1000

为：

start with managerid = 1000

Answer 2

首先，让我们设置测试数据......

CREATE TABLE EMPLOYEE (
    EMPLOYEE_ID INT PRIMARY KEY,
    MANAGER_ID INT,
    NAME VARCHAR2(20),
    TITLE VARCHAR2(20),
    FOREIGN KEY (MANAGER_ID) REFERENCES EMPLOYEE (EMPLOYEE_ID)
);

INSERT INTO EMPLOYEE(EMPLOYEE_ID, NAME, TITLE) VALUES (1, 'Rob', 'CEO');
    INSERT INTO EMPLOYEE VALUES (2, 1, 'Bob', 'Manager');
        INSERT INTO EMPLOYEE VALUES (3, 2, 'Matilda', 'Secretary');
    INSERT INTO EMPLOYEE VALUES (4, 1, 'Steve', 'Manager');
        INSERT INTO EMPLOYEE VALUES (5, 4, 'John', 'Senior Worker');
            INSERT INTO EMPLOYEE VALUES (6, 5, 'Paul', 'Junior Worker');
        INSERT INTO EMPLOYEE VALUES (7, 4, 'Anny', 'Senior Worker');

以下查询以递归方式返回Steve及其所有下属：

SELECT *
FROM EMPLOYEE
START WITH EMPLOYEE_ID = 4
CONNECT BY PRIOR EMPLOYEE_ID = MANAGER_ID;

EMPLOYEE_ID        MANAGER_ID         NAME                 TITLE                
------------------ ------------------ -------------------- -------------------- 
4                  1                  Steve                Manager              
5                  4                  John                 Senior Worker        
6                  5                  Paul                 Junior Worker        
7                  4                  Anny                 Senior Worker

“翻转”PRIOR给了我们史蒂夫的上司：

SELECT *
FROM EMPLOYEE
START WITH EMPLOYEE_ID = 4
CONNECT BY EMPLOYEE_ID = PRIOR MANAGER_ID;

EMPLOYEE_ID        MANAGER_ID         NAME                 TITLE                
------------------ ------------------ -------------------- -------------------- 
4                  1                  Steve                Manager              
1                                     Rob                  CEO

带有经理ID和员工ID的Oracle 10递归

2 个答案: