Question

我在这里的第一篇文章，希望得到一些帮助。我需要创建一份报告，显示从未退休的员工。我需要从3个表中提取信息。如果员工有特定扣减代码（7001至7006），则已支付退休金。我有以下表格和列。

Employee
Employee.empid
Employee.fname
Employee.lname
Employee.jobclass


EarnHistory
EarnHistory.empid
EarnHistory.hoursworked
EarnHistory.checknumber
EarnHistory.checkdate


DeductionHistory
DeductionHistory.empid
DeductionHistory.deductioncode
DeductionHistory.checknumber
DeductionHistory.checkdate

查询需要提取empid，fname，lname，hoursworked，deductioncode 如果员工从未支付扣除代码7001至7006。

我尝试过使用NOT EXISTS

失败了

Answer 1

这样的事情应该有效：

SELECT E.empid, E.fname, E.lname, EH.hoursworked, DH.deductioncode
FROM Employee E
   INNER JOIN EarnHistory EH ON E.empid = EH.empid
   INNER JOIN DeductionHistory DH ON E.empid = DH.empid
   LEFT JOIN DeductionHistory DH2 ON E.empid = DH2.empid 
       AND DH2.deductioncode IN (7001,7002,7003,7004,7005,7006)
WHERE DHD2.empid IS NULL

这取决于您的扣减代码数据类型。您可以使用BETWEEN，＆lt;＆gt;或添加撇号（如果varchar。

）

您也可以使用NOT EXISTS：

SELECT E.empid, E.fname, E.lname, EH.hoursworked, DH.deductioncode
FROM Employee E
   INNER JOIN EarnHistory EH ON E.empid = EH.empid
   INNER JOIN DeductionHistory DH ON E.empid = DH.empid
WHERE NOT EXISTS (SELECT * 
                  FROM DeductionHistory 
                  WHERE deductioncode IN (7001,7002,7003,7004,7005,7006)
                     AND E.empid = DeductionHistory.empid)

祝你好运。

Answer 2

select Employee.empid, Employee.fname , Employee.lname,EarnHistory.hoursworked,           DeductionHistory.deductioncode from Employee 
    join EarnHistory using('empid')  
    join DeductionHistory using('empid')  
    LEFT JOIN DeductionHistory dh ON Empployee.empid = dh.empid 
    AND DH.deductioncode IN (7001,.......,7006)
    WHERE DHD.empid IS NULL

Answer 3

SELECT E.empid, E.fname, E.lname, EH.hoursworked, DH.deductioncode
  FROM Employee E, EarnHistory EN, DeductionHistory DH
 WHERE E.empid = EH.empid
   AND E.empid = DH.empid
   AND E.empid <> (SELECT empid
                     FROM DedutionHistory
                    GROUP BY empid 
                   HAVING deductioncode >= 7001
                      AND deductioncode <= 7006)

需要查询才能找到尚未退休的员工

3 个答案: