Question

我正在评估HIERARCHYID数据类型，看它是否符合我对项目的需求。我希望用它来获得给定员工ID的经理。我正在查看AdventureWorks DB（2012版）中的表，特别是Person.Person和HumanResources.Employee表。

我的查询是这样的：

SELECT 
    pp.LastName + ', ' + pp.FirstName AS Name,
    CAST(hre.NationalIdNumber AS BIGINT) AS Id,
    hre.LoginID,
    hre.OrganizationNode.GetAncestor(1) AS ManagerId,
    hre.JobTitle,
    hre.BirthDate,
    hre.MaritalStatus,
    hre.Gender,
    hre.HireDate
FROM 
    Person.Person pp
INNER JOIN 
    HumanResources.Employee hre ON pp.BusinessEntityID = hre.BusinessEntityID

现在我预料到因为GetAncestor（）是一个CLR函数，我已经能够做一些像hre.OrganizationNode.GetAncestor（1）.NationalIdNumber AS ManagerId但我被告知我不值得非常快

我在这里做错了什么？

稍后编辑

四处游戏让我想到这一点，但这不是最佳的（或者是它？）

SELECT
    pp.LastName + ', ' + pp.FirstName AS Name,
    CAST(hre.NationalIdNumber AS BIGINT) AS Id,
    hre.LoginID,
    NULL AS ManagerId,
    hre.JobTitle,
    hre.BirthDate,
    hre.MaritalStatus,
    hre.Gender,
    hre.HireDate,
    hre.OrganizationLevel
FROM 
    Person.Person pp
INNER JOIN 
    HumanResources.Employee hre ON pp.BusinessEntityID = hre.BusinessEntityID
WHERE 
    OrganizationLevel = 0
UNION
SELECT
    pp.LastName + ', ' + pp.FirstName AS Name,
    CAST(hre.NationalIdNumber AS BIGINT) AS Id,
    hre.LoginID,
    CAST(hre2.NationalIDNumber AS BIGINT) AS ManagerId,
    hre.JobTitle,
    hre.BirthDate,
    hre.MaritalStatus,
    hre.Gender,
    hre.HireDate,
    hre.OrganizationLevel
FROM 
    Person.Person pp
INNER JOIN 
    HumanResources.Employee hre ON pp.BusinessEntityID = hre.BusinessEntityID
INNER JOIN 
    HumanResources.Employee hre2 ON hre.OrganizationNode.GetAncestor(1) = hre2.OrganizationNode
ORDER BY
    hre.OrganizationLevel ASC

Answer 1

相关的子查询似乎对我有用：

SELECT 
    pp.LastName + ', ' + pp.FirstName AS Name,
    CAST(hre.NationalIdNumber AS BIGINT) AS Id,
    hre.LoginID,
    (
        SELECT NationalIDNumber
        FROM HumanResources.Employee AS m
        WHERE OrganizationNode = hre.OrganizationNode.GetAncestor(1)
    )AS ManagerId,
    hre.JobTitle,
    hre.BirthDate,
    hre.MaritalStatus,
    hre.Gender,
    hre.HireDate
FROM 
    Person.Person pp
INNER JOIN 
    HumanResources.Employee hre ON pp.BusinessEntityID = hre.BusinessEntityID

使用HIERARCHYID时尝试获取祖先的列值

1 个答案: