Sql Group By Query with innerjoin

Hiii...

My sql Query is as follows:
select (COALESCE(Mst_Submission.UniqueNo + ',','') + COALESCE (Investigator.InvestigatorName + ',','')+ PROPOSAL_INVESTIGATOR.Type) from PROPOSAL_INVESTIGATOR INNER JOIN MST_SUBMISSION ON PROPOSAL_INVESTIGATOR.UniqueNo = MST_SUBMISSION.UniqueNo INNER JOIN Investigator ON PROPOSAL_INVESTIGATOR.InvestigatorID = Investigator.Id where MST_SUBMISSION .UniqueNo ='11220'


The output for this query is :

11220,Sajjad Ur Rahman *,Principal Investigator
11220,Sufwan Alomar,Co-Investigator
11220,Hilal Al Rifai,Principal Investigator
11220,Rawia A. Jarir *,Co-Investigator
11220,Ahmed Masoud *,Principal Investigator
11220,Samer Taha *,Co-Investigator
11220,Ashraf Mansour,Co-Investigator
11220,Mohamad Adnan Mahmah * ,Co-Investigator
11220,Moaz Soliman,Co-Investigator

could any one help me to use Group By clause for making this output as :

11220, Sajjad Ur Rahman *,Principal Investigator,Sufwan Alomar,Co-Investigator,Hilal Al Rifai,Principal Investigator,Rawia A. Jarir *,Co-Investigator,Ahmed Masoud *,Principal Investigator,Samer Taha *,Co-Investigator,Ashraf Mansour,Co-Investigator,Mohamad Adnan Mahmah * ,Co-Investigator,Moaz Soliman,Co-Investigator

All your help is highly appreciated

It's not group by can do, take look at pivot instead.