Question

I want to create a database for soccer scores.

Obviously, we have:

• Countries (Netherlands, Germany, (But also Europe))
• Competitions (Eredivisie, Bundesliga, UEFA Europa League)
• Teams (FC Twente, Bayern Munchen, Atletico Madrid)
• Players (Luuk de Jong, Manuel Neuer, Tiago Mendes)
• Matches (FC Twente – PSV, Bayern – Leverkusen, etc)
• Events (Goal scored in 40th minute by Luuk de Jong)

I’m using Dezign in which I have created the scheme below:

Obviously, a Competition is bound to a Country, a Player to a Team, etc.

But then some problems occur. An Event belongs to a Match and a Player. So the Event could get a match_id and a player_id. But then any player of any team could ‘score’ in a match in which he doesn’t belong (A player of team C could score in a match between team A and team B). How can I restrict this for example?

Also, a Team could compete in its ‘normal’ competition, but also in the Champions League. Thus, a simple competition_id in the Team entity would not suffice.

And do you suggest any other thoughts?

Edit in response to Philipp

Answer 1

You lack an entity to express the Lineup(team, match) along with a LineupPosition (lineup, player).

You could then associate an Event with a LineupPosition (specific player in a specific match), thereby linking your Event to the correct Match, via LineupPosition->Lineup->Match.