PL/SQL - 連接3個表得到含糊不清的錯誤列

Question

我在PL/SQL中加入3個表，員工，部門和其他員工爲管理員。但是，當我運行該腳本

Error report: 
ORA-06550: line 19, column 9: 
PL/SQL: ORA-00918: column ambiguously defined 
ORA-06550: line 9, column 3: 
PL/SQL: SQL Statement ignored 
06550. 00000 - "line %s, column %s:\n%s" 
*Cause: Usually a PL/SQL compilation error. 
*Action: 

我在PL/SQL新，因此無法瞭解這些錯誤意味着我得到這個錯誤。

這裏是開始塊內的select語句在那裏我得到的錯誤

select e.first_name||' '||e.last_name AS Employee , 
      m.first_name||' '||m.last_name AS Manager , 
      e.job_id AS jobemp , 
      d.department_name AS Department , 
      e.salary AS Salary 
    into ename, manager, jobid, depn, sal 
    from employees e join departments d 
      on (e.department_id = d.department_id) 
     join employees m 
      on (e.manager_id = m.employee_id) 
    where salary = (select min(salary) from employees) 
    ; 

任何人誰可以幫我鑑定這個錯誤？ 在此先感謝。

Answer 1

指定哪個表salary來自於你的where子句

select e.first_name||' '||e.last_name AS Employee , 
      m.first_name||' '||m.last_name AS Manager , 
      e.job_id AS jobemp , 
      d.department_name AS Department , 
      e.salary AS Salary 
    into ename, manager, jobid, depn, sal 
    from employees e join departments d 
      on (e.department_id = d.department_id) 
     join employees m 
      on (e.manager_id = m.employee_id) 
    where e.salary = (select min(salary) from employees);