[英]How to select records with two columns matching values in one table?
我在線創建一個請求表單,員工在系統中生成請求,但他/她的老板只能查看在他下面工作的員工請求。
例如:在一個組織中,有不同的員工在1個老板下工作。
---------------------
|EmpNo |BossNo |
---------------------
|011 |001 |
|012 |001 |
|013 |001 |
|014 |002 |
---------------------
在上面的表格場景中,如果員工(012)將生成任何請求,那么只有boss(001)能夠查看該請求沒有其他人,與員工(014)相同將生成任何請求然后只有boss(002)能夠查看該請求並接受它。
我想為此創建SQL查詢。但是我無法為此創建查詢。 以下是查詢
select e1.empno, e1.bossno
from employeedetails as e1
inner join employeedetails as e2
on e1.empno= e2.empno
and e1.bossno= e2.bossno
group by e1.empno, e1.bossno
order by e1.empno, e1.bossno
因為,兩個表都檢索相同的值,然后使用join作為e1.empno= e2.empno and e1.bossno= e2.bossno
我認同:
select e1AsBoss.empno as idBoss , e2AsEmployer.empno as idEmployer
from employeedetails as e1AsBoss
inner join employeedetails as e2AsEmployer
on e1AsBoss.empno= e2AsEmployer.bossno
group by e1AsBoss.empno, e2AsEmployer.empno
order by e1AsBoss.empno, e2AsEmployer.empno
像這樣的東西:
SELECT request.Info, request.empno, empDetails.EmployeeName
FROM requestTable as Request
INNER JOIN employeedetails AS empDetails ON Request.empno = empDetails.empno
WHERE empDetails.bossno = @IdOfLoggedInEmployee
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