Merging results from SQL Query, where most values are the same [duplicate] - sql-server

Question

This question already has answers here:
Simulating group_concat MySQL function in Microsoft SQL Server 2005?
(12 answers)
Closed 6 years ago.
Sorry for the not-so-great title.
I'm triyng to merge together sets of results to provide a quick view of some data.
If I have this query:
SELECT
tblPriv.ID, tblGroups.Name AS 'Group', tblPriv.User, tblPriv.Role
FROM
tblPriv
INNER JOIN
tblGroups on tblPriv.ID = tblGroups.ID
which returns these results:
ID GROUP USER ROLE
---------------------------------
1 Taxes DAVE Admin
1 Taxes JOHN Admin
1 Taxes BOB PowerUser
2 Catering RON Admin
2 Catering JACK PowerUser
2 Catering JIM PowerUser
(where ID is relational to say, a group, stored in another table)
What I ideally want to do is get 1 record for a group:
ID GROUP ADMINS POWERUSERS
---------------------------------------------
1 Taxes DAVE; JOHN; BOB
2 Catering RON; JACK; JIM;
I know the roles beforehand - they always stay the same, and new roles are not added, ever.
How would I go about doing this? (I will also include data from other relational tables)

Answer 1

SELECT
DISTINCT tp.ID,
tp.[GROUP],
ISNULL(STUFF(Admins.Admins, 1, 1, ''), '') AS Admins,
ISNULL(STUFF(PowerUsers.PowerUsers, 1, 1, ''), '') AS PowerUsers
FROM tlbPriv AS tp
OUTER APPLY
(
SELECT ' ' + tmp.[USER] + ';'
FROM tlbPriv AS tmp
WHERE tmp.ID = tp.ID AND [tmp].[ROLE] = 'Admin' FOR XML PATH('')
)Admins(Admins)
OUTER APPLY
(
SELECT ' ' + tmp.[USER] + ';'
FROM tlbPriv AS tmp
WHERE tmp.ID = tp.ID AND [tmp].[ROLE] = 'PowerUser' FOR XML PATH('')
)PowerUsers(PowerUsers)

Answer 2

For your particular problem:
select g.id, g.name,
stuff((select '; ' + p.user
from tblPriv p
where p.id = g.id and p.role = 'Admin'
for xml path ('') type
).value('', 'varchar(max)'
), 1, 2, ''
) as admins,
stuff((select '; ' + p.user
from tblPriv p
where p.id = g.id and p.role = 'PowerUser'
for xml path ('') type
).value('', 'varchar(max)'
), 1, 2, ''
) as PowerUsers
from tblGroups g

Answer 3

Tagged tsql, I assume this is for MS SQL server:
DECLARE #users TABLE
(
[ID] INT ,
[GROUP] VARCHAR(8) ,
[USER] VARCHAR(4) ,
[ROLE] VARCHAR(9)
);
INSERT INTO #users
( [ID], [GROUP], [USER], [ROLE] )
VALUES ( 1, 'Taxes', 'DAVE', 'Admin' ),
( 1, 'Taxes', 'JOHN', 'Admin' ),
( 1, 'Taxes', 'BOB', 'PowerUser' ),
( 2, 'Catering', 'RON', 'Admin' ),
( 2, 'Catering', 'JACK', 'PowerUser' ),
( 2, 'Catering', 'JIM', 'PowerUser' );
WITH data ( ID, [GROUP], [ROLE], [MEMBERS] )
AS ( SELECT u.ID ,
u.[GROUP] ,
u.ROLE ,
( SELECT [USER] + ';'
FROM #users AS [u1]
WHERE u.ID = u1.ID AND u.[GROUP] = u1.[GROUP] and u.ROLE = u1.ROLE
FOR
XML PATH('')
)
FROM #users AS [u]
)
SELECT ID ,
[GROUP] ,
[Admin] AS [Admins] ,
[PowerUser] AS [POWERUSERS]
FROM data PIVOT ( MAX(MEMBERS) FOR [ROLE] IN ( [Admin], [PowerUser] ) ) pvt;

Answer 4

In MYSQL Use group concat
SELECT
tblPriv.ID
, tblGroups.Name AS 'Group'
, group_concat(t1.User) AS ADMINS, group_concat(t2.User) AS POWERUSERS
FROM tblPriv
INNER JOIN tblGroups as t1 on t1.ID = tblGroups.ID and t1.user='ADMIN'
INNER JOIN tblGroups as t2 on t2.ID = tblGroups.ID and t1.user='POWERUSER'
GROUP BY tblPriv.ID