临时记录sql 合并同一列中的值

select PR.Id, PR.Name as RoleName, Left(Final.UserList, LEN(Final.UserList) - 1) as Members
                                    from ProjectRoles PR
                                    left join (select ProjectRoleId,(
                                            select Name + ','
                                                from (select M.ProjectRoleId, U.Name
                                                    from ProjectMembers M
                                                    join Users U on M.UserId = U.Id) SourceTB
                                                where SourceTB.ProjectRoleId = PM.ProjectRoleId
                                                order by ProjectRoleId for xml path('')) as UserList
                                            from (select M.ProjectRoleId, U.Name
                                                    from ProjectMembers M
                                                    join Users U on M.UserId = U.Id) PM
                                            group by ProjectRoleId) Final on PR.Id = Final.ProjectRoleId

有点乱 ！！