SQL：帮助识别模式

Question

我有一个看起来像这样的表：

我要做的是根据相同的ResourceName和Permissions合并组，并为它们提供相同的唯一标识符。但是，我有多个组重复自己的多个ResourceNames，并且无法为同一组提供另一个唯一ID。

例如，GroupAdmin和GroupUser1将是一个具有ID和GroupUser2的集合，而GroupUser3将是另一个集合。我有这样的数百万行。

请帮我写一个查询或一些代码来解决这个问题。谢谢！

编辑添加了没有图片的表格

ResourceName    Permissions        GroupName
Resource1           Modify             GroupAdmin
Resource1           Modify             GroupUser1
Resource1           Read & Execute         GroupUser2
Resource1           Read & Execute         GroupUser3
Resource2           Modify             GroupAdmin
Resource2           Modify             GroupUser1
Resource2           Read & Execute         GroupUser2
Resource2           Read & Execute         GroupUser3
Resource3           Modify             GroupAdmin
Resource3           Modify             GroupUser1
Resource3           Read & Execute         GroupUser2
Resource3           Read & Execute         GroupUser3
Resource4           Modify             GroupAdmin
Resource4           Modify             GroupUser1
Resource4           Read & Execute         GroupUser2
Resource4           Read & Execute         GroupUser3

Answer 1

select r + '-' + p as id, r, p, g from rpg;

将以非常简单的方式为您提供一个ID，基于相同的ResourceName r和Permissions p。

或者你可以这样做：

select r, p, g, rank() over(order by r, p) as id from rpg;

Answer 2

建议，下次有助于添加所需结果的表格。话虽如此，我想我想出了你想要的东西。

试试这个：

--Create A Simple Version of YourTable
SELECT * INTO YourTable
FROM
(
    SELECT 'Resource1' AS ResourceName, 'Modify' AS [Permissions], 'GroupAdmin' AS GroupName
    UNION ALL
    SELECT 'Resource1', 'Modify', 'GroupUser1'
    UNION ALL
    SELECT 'Resource1', 'Read & Execute', 'GroupUser2'
    UNION ALL
    SELECT 'Resource1', 'Read & Execute', 'GroupUser3'

) A


SELECT  A.ID,
        B.GroupName

FROM
(
    --Groups Resource and Permssion combinations and assigns ID using row_number()
    SELECT  ROW_NUMBER() OVER (ORDER BY ResourceName,[Permissions]) ID,
            ResourceName,[Permissions]
    FROM YourTable
    GROUP BY ResourceName,[Permissions]
) A
--Match up your GroupNames to your Resource/Permssion Pairs
INNER JOIN YourTable B
    ON A.ResourceName = B.ResourceName
    AND A.[Permissions] = B.[Permissions]

结果：

ID                   GroupName
-------------------- ----------
1                    GroupAdmin
1                    GroupUser1
2                    GroupUser2
2                    GroupUser3