Converting an ER Diagram to Relational Tables

Project Overview

This project demonstrates the conversion of an Entity-Relationship (ER) diagram into relational tables in SQL Server. The goal is to ensure a well-structured database capable of handling complex queries efficiently.

Key Features

• Table Creation: Define and create multiple tables (Customer, Account, Branch, Loan, Depositor, Borrower, AccountBranch, LoanBranch) with relevant columns and primary key relationships.
• Relationship Management: Establish foreign key relationships between tables to reflect the ER diagram accurately.
• Data Integrity: Ensure data integrity and consistency through the use of primary and foreign keys.

Libraries Used

• MSSQL: The core SQL database management system used for creating and querying the database.

Code Explanation

The project includes multiple steps to modularize the implementation:

1. Creating the Customer table: Define a table with columns for customer name, city, and street, with the customer name as the primary key.
2. Creating the Account table: Define a table with columns for account number and balance, with the account number as the primary key.
3. Creating the Branch table: Define a table with columns for branch name, city, and assets, with the branch name as the primary key.
4. Creating the Loan table: Define a table with columns for loan number and amount, with the loan number as the primary key.
5. Creating the Depositor table: Define a relationship table with columns for customer name and account number, establishing foreign key relationships with the Customer and Account tables.
6. Creating the Borrower table: Define a relationship table with columns for customer name and loan number, establishing foreign key relationships with the Customer and Loan tables.
7. Creating the AccountBranch table: Define a relationship table with columns for account number and branch name, establishing foreign key relationships with the Account and Branch tables.
8. Creating the LoanBranch table: Define a relationship table with columns for loan number and branch name, establishing foreign key relationships with the Loan and Branch tables.

Code Structure

The code is structured to ensure clarity, reusability, and maintainability:

1. Creating the Customer table
2. Creating the Account table
3. Creating the Branch table
4. Creating the Loan table
5. Creating the Depositor table
6. Creating the Borrower table
7. Creating the AccountBranch table
8. Creating the LoanBranch table

Prerequisites

• MSSQL installed on your machine.

Explanation

This project demonstrates how to effectively convert an ER diagram into relational tables in SQL Server. By following these steps, we ensure our database is well-structured and capable of handling complex queries efficiently. This showcases essential SQL skills that are valuable in any data-driven role.

Insights

• Table Creation: Showcased the ability to define multiple related tables with primary and foreign key relationships.
• Relationship Management: Demonstrated proficiency in establishing foreign key relationships to maintain data integrity.
• Data Integrity: Highlighted the use of primary and foreign keys to ensure data consistency and reliability.
• Database Design: Illustrated the process of converting an ER diagram into a well-structured relational database.

Future Enhancements

1. Advanced Querying:

   • Implement more complex queries involving joins, subqueries, and window functions.

2. Data Integrity:

   • Add additional constraints and indexes to further enhance data integrity and query performance.

3. Normalization:

   • Normalize the database to eliminate redundancy and improve data organization.

4. Stored Procedures and Functions:

   • Create stored procedures and functions to encapsulate complex business logic.

5. Performance Tuning:

   • Optimize queries and database schema for better performance.