Convert rows to single column using t-sql

Question

Hi All,
I have a table with 7 columns, et say..
  ID ,PatientName,Date,Time,Room_Num ,Specialized, DoctorName
My source date looks like this..
  ID      PatientName     Date          Time    Room_Num  Specialized   DoctorName
   1         Sam        10/02/2010      10:00     4         Heart        
John
   1         Sam        10/02/2010      10:00     4         Lungs        
Harris
   2         Jones      11/12/2011      11:00     1         Lungs        
Bob
   3         Jim        12/05/2001      01:00     2         Kidney       
Greg
   3         Jim        12/05/2001      09:00     2         Eye          
Roby
   1         Sam        12/22/2010      11:00     1         Heart        
John
   1         Sam        12/22/2010      11:00     1         Lungs        
Harris
My out put should look like this..
   ID      PatientName     Date             DoctorName
   1         Sam        10/02/2010           John,Harris ( Need to be in 1 row because - ID, PatientName, Date is same)
   2         Jones      11/12/2011            Bob       ( Need to show as it is due to no repeatition
of ID)
   3         Jim        12/05/2001            Greg,Roby   ( Need to be in 1 row because - ID, PatientName,
Date is same)
   1         Sam        12/22/2010            John,Harris ( Need to be in 1 row because - ID, PatientName, Date is same)
I am using below query to get above results but I am getting wrong results..Need some help in tweaking the query...
 SELECT DISTINCT ID ,PatientName , Date 
         ,STUFF(( SELECT ',' + DoctorName 
          FROM SampleTable ST1
          WHERE ST1.ID=ST2.ID
          FOR XML PATH('')),1,1,' ') AS DoctorName
          FROM SampleTable1 ST2
GROUP BY ID ,PatientName , Date
With above query I am getting results like this...
  ID      PatientName     Date             DoctorName
   1         Sam        10/02/2010         John,Harris ,John,Harris ( here John,Harris are repeating twice because of 4th row)
   2         Jones      11/12/2011         Bob      
   3         Jim        12/05/2001         Greg,Roby   
   1         Sam        12/22/2010         John,Harris ,John,Harris ( here John,Harris are repeating twice because of 1st row)
Create table statement:
Create table SampleTable
ID Int null,     PatientName  varchar(25) null,   Date  datetime null,  Time varchar(10) null,   Room_Num int null, Specialized  varchar(20) null, DoctorName varchar(20) null
Insert statement:
Insert into sampletable(ID,PatientName,Date,Time,Room_Num,Specialized,DoctorName) Values ( 1,'Sam','10/02/2010' ,'10:00',4 ,'Heart','John')
 Insert into sampletable(ID,PatientName,Date,Time,Room_Num,Specialized,DoctorName) Values ( 1, 'Sam','10/02/2010' ,'10:00'   ,  4    ,     'Lungs','Harris')
 Insert into sampletable(ID,PatientName,Date,Time,Room_Num,Specialized,DoctorName) Values ( 2, 'Jones' ,'11/12/2011'  ,    '11:00',1, 'Lungs',  'Bob')
 Insert into sampletable(ID,PatientName,Date,Time,Room_Num,Specialized,DoctorName) Values  ( 3,'Jim' ,'12/05/2001'    ,  '01:00',2,'Kidney' ,  'Greg')
 Insert into sampletable(ID,PatientName,Date,Time,Room_Num,Specialized,DoctorName) Values ( 3,'Jim' ,'12/05/2001'     , '09:00',2,'Eye' ,   'Roby')
 Insert into sampletable(ID,PatientName,Date,Time,Room_Num,Specialized,DoctorName) Values ( 1,'Sam' ,'12/22/2010'     , '11:00',1,'Heart', 'John')
 Insert into sampletable(ID,PatientName,Date,Time,Room_Num,Specialized,DoctorName) Values ( 1,'Sam', '12/22/2010'     , '11:00',1 , 'Lungs','Harris')
I need help to tweak my query.
Thanks,
RH
sql

Answer 1

WITH cte AS(
SELECT [ID]
,[PatientName]
,[Date]
,[Time]
,[Room_Num]
,[Specialized]
,[DoctorName]
,ROW_NUMBER() OVER(PARTITION BY [ID],[PatientName],[Date] ORDER BY Time) as RowID
FROM [test].[dbo].[SampleTable]
SELECT
cte.[ID]
,cte.[PatientName]
,CAST(cte.[Date] as DATE) as [Date]
,STUFF((SELECT ',' + c.[DoctorName]
FROM cte c
WHERE c.ID=cte.ID AND c.PatientName=cte.[PatientName] AND c.[Date]=cte.[Date]
FOR XML PATH(''),TYPE).value('.','varchar(max)')
,1,1,'') AS [DoctorName]
FROM cte
WHERE cte.RowID=1