给定 2 个表，如何将它们合并到一个视图中？

Question

鉴于以下 ADuser 表：

AD Group    UserID
Group1      User1
Group2      User2
Group3      User1
Group3      User3

和Group_Access表：

AD Group    Org Codes
Group1   M500_ABC|1098|123_KL|Z45557|f908L_P|234G|
Group2   123_KL|Z45557|f908L_P|
Group3   12345|

我如何将它们合并到一个视图中，以便我们最终得到这样的结果，其中组织代码组合在 1 个匹配的用户 ID 下？

UserID      Org Codes
User1       M500_ABC|1098|123_KL|Z45557|f908L_P|234G|12345|
User2       123_KL|Z45557|f908L_P|
User3       12345|

请注意，由于 User1 属于多个组，即 Group1 和 Group3，因此 user1 的这 2 个组中的所有组织代码在最终视图中合并为 1，附加额外的 12345| 组织代码

到目前为止我尝试了什么：

CREATE VIEW UserOrgCodesView
AS SELECT ADuser.UserID, Group_Access.[Org Codes]
FROM ADuser
INNER JOIN Group_Access ON ADuser.[AD Group]=Group_Access.[AD Group];

但这已经在下面产生了

UserID  Org Codes
User1   M500_ABC|1098|123_KL|Z45557|f908L_P|234G|12345|
User2   123_KL|Z45557|f908L_P|
User1   12345|
User3   12345|

Answer 1

组织代码在哪里组合在 1 个匹配的用户 ID 下？

You'll need to use STRING_AGG which is only available in SQL Server 2017 or later.

此查询还在输入[Org Codes] 值上使用TRIM()，以帮助防止'||' 在现有字符串连接在一起时出现在输出中。

SELECT
    u.UserId,
    STRING_AGG( TRIM( '|' FROM g.[Org Codes] ), '|' ) AS [Org Codes]
FROM
    ADuser AS u
    INNER JOIN Group_Access AS g ON u.[AD Group] = g.[AD Group]
GROUP BY
    u.UserId;

也就是说，像这样对数据进行非规范化通常是个坏主意。您应该将面向行的数据返回给客户端，并且只对 UI 层中的数据进行非规范化。

Answer 2

您可以使用STRING_AGG（如果 SQL Server 2017 及更高版本）或XML PATH（如果 SQL Server 2017 之前）。

CREATE TABLE aduser (ADGroup SYSNAME, UserID sysName)

create table group_access (ADgroup sysname, OrgCodes VARCHAR(4000))

insert into aduser values
('Group1','User1'),
('Group2','User1');

insert into group_access values
('Group1','M500_ABC|1098|123_KL|Z45557|f908L_P|234G|'),
('Group2',' 123_KL|Z45557|f908L_P|')

CREATE VIEW UserOrgCodesView_SQL2017onwards
AS
SELECT ad.UserID, STRING_AGG(gc.OrgCodes,'') as Orgcodes 
FROM aduser as ad
inner join group_access as gc
on gc.ADGroup = ad.ADGroup
group by ad.UserID

CREATE VIEW UsersOrgCodesView_Before2017
as
SELECT oad.UserID, STUFF((SELECT gc.OrgCodes+'' FROM group_access as gc
inner join aduser as ad
on gc.ADGroup = ad.ADGroup 
where ad.UserID = oad.UserID
FOR XML PATH('')),1,0,'') as Orgcodes 
FROM aduser as oad
group by Oad.UserID

Answer 3

您可以尝试以下方法：

CREATE TABLE TmpTblADUser (GroupName VARCHAR(10), UserID VARCHAR(10));
INSERT INTO TmpTblGroupAccess VALUES
  ('Group1', 'M500_ABC|1098|123_KL|Z45557|f908L_P|234G|'),
  ('Group2', '123_KL|Z45557|f908L_P|'),
  ('Group3', '12345|')



CREATE TABLE TmpTblGroupAccess (GroupName VARCHAR(10), OrgCodes VARCHAR(1000));
INSERT INTO TmpTblGroupAccess VALUES
('Group1', 'M500_ABC|1098|123_KL|Z45557|f908L_P|234G|'),
('Group2', '123_KL|Z45557|f908L_P|'),
('Group3', '12345|')

CREATE VIEW UserOrgCodesView
AS SELECT u.UserID, g.OrgCodes
FROM TmpTblADUser u
INNER JOIN TmpTblGroupAccess g ON u.GroupName = g.GroupName;


SELECT t.UserID,
       STUFF((SELECT OrgCodes + '' FROM UserOrgCodesView WHERE UserID = t.UserID FOR XML PATH ('')), 1, 0, '') AS GrupList  
       FROM UserOrgCodesView t
GROUP BY t.UserID