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Team Team_Name -PK |Team_City D_Location - FK mploy

Team Team_Name -PK |Team_City D_Location - FK mploy

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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**Entity-Relationship Diagram (ERD) Explanation** This ERD represents the relationships between two entities: "Team" and "Player." Each entity has specific attributes, and their relationships are expressed through connecting lines. **Entities and Attributes:** 1. **Team** - **Attributes:** - `Team_Name` (Primary Key, PK): A unique identifier for each team. - `Team_City`: The city where the team is based. - `D_Location` (Foreign Key, FK): A reference to another table for location details. 2. **Player** - **Attributes:** - `Player_Name` (Primary Key, PK): A unique identifier for each player. - `Player_Number` (Primary Key, PK): Another unique identifier that complements the player's name for uniqueness. - `Team_Name` (Foreign Key, FK): Links the player to the respective team. - `Goals`: The number of goals scored by the player. - `Assists`: The number of assists made by the player. - `Points`: The total points accumulated by the player. **Relationships:** - **"Employ" Relationship (Between Team and Player):** - A vertical line connects the `Team` entity to the `Player` entity, indicating a relationship where teams employ players. - **"Play for" Relationship:** - Horizontal connecting lines indicate the association where players play for a specific team, with the relationship specified via foreign keys. **Using SQL to Create This ERD:** The SQL code necessary to produce this ERD involves creating tables with appropriate primary keys, foreign keys, and attributes as described. **Example SQL Code:** ```sql CREATE TABLE Team ( Team_Name VARCHAR(255) PRIMARY KEY, Team_City VARCHAR(255), D_Location INT, FOREIGN KEY (D_Location) REFERENCES LocationTable(LocationID) ); CREATE TABLE Player ( Player_Name VARCHAR(255), Player_Number INT, Team_Name VARCHAR(255), Goals INT, Assists INT, Points INT, PRIMARY KEY (Player_Name, Player_Number), FOREIGN KEY (Team_Name) REFERENCES Team(Team_Name) ); ``` This code establishes the framework for the relationship between teams and players, ensuring data integrity through the use of primary and foreign keys.
Transcribed Image Text:**Entity-Relationship Diagram (ERD) Explanation** This ERD represents the relationships between two entities: "Team" and "Player." Each entity has specific attributes, and their relationships are expressed through connecting lines. **Entities and Attributes:** 1. **Team** - **Attributes:** - `Team_Name` (Primary Key, PK): A unique identifier for each team. - `Team_City`: The city where the team is based. - `D_Location` (Foreign Key, FK): A reference to another table for location details. 2. **Player** - **Attributes:** - `Player_Name` (Primary Key, PK): A unique identifier for each player. - `Player_Number` (Primary Key, PK): Another unique identifier that complements the player's name for uniqueness. - `Team_Name` (Foreign Key, FK): Links the player to the respective team. - `Goals`: The number of goals scored by the player. - `Assists`: The number of assists made by the player. - `Points`: The total points accumulated by the player. **Relationships:** - **"Employ" Relationship (Between Team and Player):** - A vertical line connects the `Team` entity to the `Player` entity, indicating a relationship where teams employ players. - **"Play for" Relationship:** - Horizontal connecting lines indicate the association where players play for a specific team, with the relationship specified via foreign keys. **Using SQL to Create This ERD:** The SQL code necessary to produce this ERD involves creating tables with appropriate primary keys, foreign keys, and attributes as described. **Example SQL Code:** ```sql CREATE TABLE Team ( Team_Name VARCHAR(255) PRIMARY KEY, Team_City VARCHAR(255), D_Location INT, FOREIGN KEY (D_Location) REFERENCES LocationTable(LocationID) ); CREATE TABLE Player ( Player_Name VARCHAR(255), Player_Number INT, Team_Name VARCHAR(255), Goals INT, Assists INT, Points INT, PRIMARY KEY (Player_Name, Player_Number), FOREIGN KEY (Team_Name) REFERENCES Team(Team_Name) ); ``` This code establishes the framework for the relationship between teams and players, ensuring data integrity through the use of primary and foreign keys.
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Step 1
  • In this ques, we have to create a table Team in which we make a combination of Team_Name, D_Location as a primary key.
  • Next, we create a table Player in which we make a combination of Player_Name, Player_Number as a primary key and Team_Name as a foreign key references to table Team.

 

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