How to make a query with group_concat in sql server [duplicate]
Query:
SELECT
m.maskid
, m.maskname
, m.schoolid
, s.schoolname
, maskdetail = STUFF((
SELECT ',' + md.maskdetail
FROM dbo.maskdetails md
WHERE m.maskid = md.maskid
FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'), 1, 1, '')
FROM dbo.tblmask m
JOIN dbo.school s ON s.ID = m.schoolid
ORDER BY m.maskname
Additional information:
String Aggregation in the World of SQL Server
Select
A.maskid
, A.maskname
, A.schoolid
, B.schoolname
, STUFF((
SELECT ',' + T.maskdetail
FROM dbo.maskdetails T
WHERE A.maskid = T.maskid
FOR XML PATH('')), 1, 1, '') as maskdetail
FROM dbo.tblmask A
JOIN dbo.school B ON B.ID = A.schoolid
Group by A.maskid
, A.maskname
, A.schoolid
, B.schoolname
This can also be achieved using the Scalar-Valued Function
in MSSQL 2008
Declare your function as following,
CREATE FUNCTION [dbo].[FunctionName]
(@MaskId INT)
RETURNS Varchar(500)
AS
BEGIN
DECLARE @SchoolName varchar(500)
SELECT @SchoolName =ISNULL(@SchoolName ,'')+ MD.maskdetail +', '
FROM maskdetails MD WITH (NOLOCK)
AND MD.MaskId=@MaskId
RETURN @SchoolName
END
And then your final query will be like
SELECT m.maskid,m.maskname,m.schoolid,s.schoolname,
(SELECT [dbo].[FunctionName](m.maskid)) 'maskdetail'
FROM tblmask m JOIN school s on s.id = m.schoolid
ORDER BY m.maskname ;
Note: You may have to change the function, as I don't know the complete table structure.
Please run the below query, it doesn't requires STUFF and GROUP BY in your case:
Select
A.maskid
, A.maskname
, A.schoolid
, B.schoolname
, CAST((
SELECT T.maskdetail+','
FROM dbo.maskdetails T
WHERE A.maskid = T.maskid
FOR XML PATH(''))as varchar(max)) as maskdetail
FROM dbo.tblmask A
JOIN dbo.school B ON B.ID = A.schoolid