Chap2 practice key
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The document provides requirements for creating an entity relationship diagram (ERD) for a National Hockey League database. It specifies that the ERD should include entities for teams, players, games and their attributes and relationships. A sample ERD is provided that models teams as having a name, city, coach and captain, players as belonging to teams and having attributes, and games as connecting two teams with a date and score.
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Chap2 practice key
- 1. Practice ER Diagram Question – A Sample Solution Suppose you are given the following requirements for a simple database for the National Hockey League (NHL): • the NHL has many teams, • each team has a name, a city, a coach, a captain, and a set of players, • each player belongs to only one team, • each player has a name, a position (such as left wing or goalie), a skill level, and a set of injury records, • a team captain is also a player, • a game is played between two teams (referred to as host_team and guest_team) and has a date (such as May 11th , 1999) and a score (such as 4 to 2). Construct a clean and concise ER diagram for the NHL database using the Chen notation as in your textbook. List your assumptions and clearly indicate the cardinality mappings as well as any role indicators in your ER diagram. Here is one sample solution. Note that other diagrams are possible depending on assumptions. date score game host guest team t-name city coach captain belongs to skill level player p-name position log injury record id description