Question

可能这很奇怪，但我需要将ActionId的值连接到对应的roleId组，而ActionID是必须的。有些像

ActionID  RoleId
"1357"     1
"2468"     2

以下是我目前的情况，我正在寻找MS SQL中的GROUP_CONCAT等价物。

select av.ActionId, ra.RoleId from RoleAction ra join ActionValue av
on ra.ActionId = av.ActionId order by av.ActionId

ActionID    RoleId
1           1
3           1
5           1
7           1
4           2
2           2
6           2
8           2

有办法吗？提前谢谢。

Answer 1

这应该有效：

    WITH CTE_A AS
    (
    select av.ActionId, ra.RoleId from RoleAction ra join ActionValue av
    on ra.ActionId = av.ActionId
    )
    SELECT DISTINCT A.RoleId,
    (SELECT '' + 
    CAST(B.ActionId AS varchar(10)) 
    FROM CTE_A B 
    WHERE B.RoleID = A.RoleID
    FOR XML PATH('')) AS ActionID
    FROM CTE_A A
    GROUP BY A.RoleID

Answer 2

您可以使用FOR XML PATH('')和内部查询使其正常工作：

SELECT DISTINCT T1.RoleID,
    (SELECT '' + ActionID 
     FROM RoleAction T2 
     WHERE T1.RoleID = T2.RoleID 
     ORDER BY ActionID 
     FOR XML PATH(''))
FROM RoleAction T1

将列值与另一个列组连接

2 个答案: