SQL Server database design users, groups, roles, memebers

问题

I have the following SQL Server db with one table so far.

----------------
|Users         | 
----------------
| UserId    PK |
|              |
| Other fields |
----------------

I need to add few more tables to it which is not a problem but this is the goal:

----------------    ----------------    ----------------   ---------------- 
|Users         |    |Roles         |    | Teams       |    | Groups       | 
----------------    ----------------    ----------------   ---------------- 
| UserId    PK |    | RoleId    PK |    | TeamId    PK |   | GroupId   PK | 
|              |    |              |    |              |   |              | 
| Other fields |    | Other fields |    | Other fields |   | Other fields | 
----------------    ----------------    ----------------   ---------------- 

What I need to achieve is the following:

• I have X amount of users

  • User1
  • User2
  • UserX

• I have 3 roles only for all users to use in all teams and groups

  • Admin
  • Member
  • Visitor

• One user can create X amount of teams

  • Team1
  • Team2
  • TeamX

• One user can create X amount of groups

  • Group1
  • Group2
  • GroupX

• Groups and Teams can have users assigned to them with different roles (Admin, Member, Visitor)

• One user can belong to one or many team or groups

• One user can belong to one or many roles

I have some hard time understanding the relation between those tables.

Here is what I managed to achieve based on the answer from @Robertas Valeika.

回答1:

You need 3 more tables. UsersRoles UsersRolesGroups UsersRolesTeams.

Relationships:

UsersRoles - UsersRolesGroups, Groups - UsersRolesGroups

UsersRoles - UsersRolesTeams, Teams - UsersRolesTeams

Users - UsersRoles, Roles - UsersRoles.

And add FK to users in groups and teams tables to identify creator of group and team.

来源：https://stackoverflow.com/questions/26145734/sql-server-database-design-users-groups-roles-memebers