Q. For Ex 2, can you give some hint about the E/R diagram on the games, teams, pitchers? A. Here is a fragment from my solution. Plays is a three-way relationship. The Teams entity set participates twice, as home and as away team. runs1, hits1, errors 1 are scores for the home team. runs2, hits2, errors2 are scores for the away team. We don't need to record the winning team; it can be inferred from runs 1 and runs2. Also, no need to distinguish between finished and ongoing games