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SELECT STUFF((SELECT ', ' + CAST(Value AS VARCHAR(10)) [text()]
         FROM @Table1 
         WHERE ID = t.ID
         FOR XML PATH(''), TYPE)
        .value('.','NVARCHAR(MAX)'),1,2,' ') List_Output
FROM @Table1 t
GROUP BY ID

DECLARE @List VARCHAR(max)

SELECT @List = COALESCE(@List + ',', '') +StaffCode
FROM   tblStaffs