Question

我想创建一个显示员工在经理下面的查询在SQL上使用5个表这是我的数据库的例子。

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当我在Query（WHERE EmpId = 1）上输入id时，它显示谁是低于id 1的员工，因此它将是EmpId 5然后是4.当EmpId = 2时，孩子是Empid 3-1-5 -4。
我是怎么做到的？

Answer 1

不确定是否理解了整个问题，但你可以尝试一下。

Declare @empid as int;
SET @empid = 1;

With A as 
(
    Select id as Subord_role
    from role
    WHERE role.parent = (Select deptrole.idrole
                            FROM Employee
                                INNER JOIN deptrole ON deptrole.id = Employee.id
                            WHERE Employee.id = @empid)
    UNION ALL

    Select Role.id
    from deptrole 
        INNER JOIN Role ON deptrole.idrole = Role.id
        INNER JOIN A ON A.Subord_role = Role.parent
    Where deptrole.iddept = (Select deptrole.iddept
                            FROM Employee
                                INNER JOIN deptrole ON deptrole.id = Employee.id
                            WHERE Employee.id = @empid)
)

Select Employee.id
FROM Employee
    INNER JOIN deptrole ON deptrole.id = Employee.id
    INNER JOIN Role ON role.id = deptrole.idrole 
    INNER JOIN A ON A.Subord_role = Role.id

使用多个表SQL Server创建层次结构递归

1 个答案: