What are the best practices for structuring MySQL databases to avoid errors and improve efficiency in PHP?

To avoid errors and improve efficiency in PHP when working with MySQL databases, it is important to follow best practices for structuring your database tables. This includes properly defining primary keys, using indexes for efficient data retrieval, normalizing your database to reduce redundancy, and utilizing appropriate data types for columns. By structuring your MySQL databases correctly, you can ensure data integrity, optimize query performance, and prevent common errors.

// Example of creating a table with proper structure in MySQL using PHP
$sql = "CREATE TABLE users (
    id INT(11) AUTO_INCREMENT PRIMARY KEY,
    username VARCHAR(50) NOT NULL,
    email VARCHAR(100) NOT NULL UNIQUE,
    password VARCHAR(255) NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
)";

// Execute the query
if ($conn->query($sql) === TRUE) {
    echo "Table created successfully";
} else {
    echo "Error creating table: " . $conn->error;
}