使用 SQL 进行层次结构过滤

Question

我的数据库中有 3 个示例表，如下所示： (一)组织结构图 (2) 用户 (3) 发票

我想使用SQL编写一个具有基于层次结构的动态过滤功能的视图。例如，如果我是用户“Jack”，他是 IT 部门的经理，当我执行视图时，我应该只看到发票 ID 1 和 3，因为发票 ID 1 属于我，发票 ID 3 属于我部门 IT 下的另一名员工“Nicole”。另外，我应该看不到发票 ID 2 和 4，因为这些发票不属于 IT 部门下的用户。

这可以在任何关系数据库中使用 SQL 来实现吗？如果可以，还请提供可以实现的SQL语句。谢谢。

Answer 1

我希望这对你有帮助：

WITH 
a AS 
(SELECT team FROM user
WHERE user_id=1),

b AS (
SELECT DISTINCT department as team, department as sub_team
FROM org
UNION
SELECT DISTINCT department as team, section as sub_team
FROM org
UNION
SELECT DISTINCT department as team, unit as sub_team
FROM org
UNION
SELECT DISTINCT section as team, section as sub_team
FROM org
UNION
SELECT DISTINCT section as team, unit as sub_team
FROM org
UNION
SELECT DISTINCT unit as team, unit as sub_team
FROM org),

c AS (
SELECT b.sub_team FROM a, b
WHERE a.team=b.team
),

d AS (
SELECT user_id FROM user, c
WHERE user.team=c.sub_team
)

SELECT invoice_id FROM invoice, d
WHERE invoice.user_id = d.user_id;

可能有一种更优雅的解决方案，但这个可行。