What are the best practices for structuring a database to store information about teachers, subjects, and courses in a PHP application?

When structuring a database to store information about teachers, subjects, and courses in a PHP application, it is best to use a relational database model with separate tables for teachers, subjects, and courses. Each table should have a primary key to uniquely identify each record, and foreign keys to establish relationships between the tables. This allows for efficient querying and retrieval of data when needed.

CREATE TABLE teachers (
    teacher_id INT PRIMARY KEY,
    teacher_name VARCHAR(50)
);

CREATE TABLE subjects (
    subject_id INT PRIMARY KEY,
    subject_name VARCHAR(50)
);

CREATE TABLE courses (
    course_id INT PRIMARY KEY,
    course_name VARCHAR(50),
    teacher_id INT,
    subject_id INT,
    FOREIGN KEY (teacher_id) REFERENCES teachers(teacher_id),
    FOREIGN KEY (subject_id) REFERENCES subjects(subject_id)
);