SQL Server：父子层次结构

Question

我在尝试创建父级和子级层次结构时遇到了麻烦。

查询：

SELECT 
    ID,
    [Manager Code],
    Manager,
    CASE WHEN [Manager Code] = 1 then
    LAG(ID) over (order by  [Manager Code] desc, ID, p_id) end as IDParentChild,
    ROW_NUMBER() over (partition by ID order by  [Manager Code] desc, ID, p_id) as RowNum
    FROM Employee
 WHERE ID IN ('90110000000','90110100000','90400000000')

表：

我有父和IDParentChild的ID，但我怎么不做父子关系？。

经理代码中的nr 1代表经理，0代表雇员。

mssql server 2012

Answer 1

试试这个：

    SELECT *, 
    CASE WHEN t.ManagerCode = 1 THEN 
        (SELECT max(manager) FROM yourTbl t1 WHERE t1.ID < t.ID AND ManagerCode = 1)
     ELSE 
        (SELECT max(manager) FROM yourTbl t1 WHERE t1.ID = t.ID AND ManagerCode = 1)
     END AS ParentManager
    FROM yourTbl t