将一列移动到另一列

Question

我有桌子

Employee 
{
EmpId,
FirstName,
LastName,
DeptId
}

Department
{
DeptId,
DeptName,
Specialization
}

现在我已将专业化列添加到Employee，所以现在新的Employee表是：

Employee 
{
EmpId,
FirstName,
LastName,
DeptId,
Specialization
}

现在我想要更新脚本将专业化数据从Department移到Employee。

Answer 1

您可以使用update-join语法：

UPDATE e
SET    e.Specialization = d.Specialization
FROM   Employee e
JOIN   Department d ON e.DeptId = d.DeptId

Answer 2

您可以使用简单的嵌套查询;

Update Employee Ee
Set    Specialization = (SELECT Specialization
                         FROM   Department Dpt
                         Where  Dpt.DeptId = Ee.DeptId)