Question

User has signed up for multiple teams (less than 30).

UserTeam table – UserId, TeamId

How about I store this as varchar like “123:0;124:1;155:1” where 123, 124 and 155 are team-ids, is there any better method? or maybe just “124:155” which means just store the teamids that do have the permission.

UserScore – UserId, ActivityId, ScoreId, TeamId’s?

What do you suggest for Oracle database?

Edit: Total number of teams could be tens of thousands or something, but total number of teams allotted to the user will be less than 30.

Answer 1

Use normalization rules to design your data model. From there de-normalize is necessary from a performance point of view.

**User**
UserId
UserData

**Team**
TeamId
TeamData


**UserTeam**
UserId
TeamId

foreign key constraints to user and team table

**UseScore** 
UserId
TeamId
ActivityId
Score

foreign key constraints to user, team and activity table