Sql server 如何更新另一个表ssms中具有相同值的列？

我有两个表-Employee表和employabor表- 员工表：

Employee Table
    EMPLOYEEID (primary key)
      ,EMPLOYEENO
      ,EMPLOYEENAME
      ,LABORCODE
      ,LOGINNAME
      ,STARTDATE
      ,ADDRESS0 

Emplabor表：

EMPLABORID (primary key)
  ,LABORCRID
  ,EMPLOYEEID
  ,LABORCODE

我想从Employee中更新Employee表中的LABORCODE列 这就是我所做的：：

UPDATE dbo.EMPLOYEE
SET LABORCODE =dbo.EMPLABOR.LABORCODE
FROM dbo.EMPLABOR
WHERE dbo.EMPLOYEE.EMPLOYEEID=dbo.EMPLABOR.EMPLOYEEID

此项工作正常已更新数据库中添加的所有员工的LABORCODE，但当我在employee表中添加新员工并从employee表中选择LABORCODE到该员工时，在employee表中找不到该员工的LABORCODE使用联接：

UPDATE emp
SET LABORCODE = empl.LABORCODE
FROM dbo.EMPLOYEE emp
JOIN dbo.EMPLABOR empl
 ON emp.EMPLOYEEID =  empl.EMPLOYEEID

使用连接：

UPDATE emp
SET LABORCODE = empl.LABORCODE
FROM dbo.EMPLOYEE emp
JOIN dbo.EMPLABOR empl
 ON emp.EMPLOYEEID =  empl.EMPLOYEEID