What potential pitfalls should be avoided when working with normalized databases in PHP for CRUD operations?

One potential pitfall to avoid when working with normalized databases in PHP for CRUD operations is not properly handling relationships between tables. It's important to understand the database schema and ensure that foreign keys are set up correctly to maintain data integrity. Additionally, make sure to use proper SQL queries to retrieve, update, and delete data across multiple tables when necessary. 

// Example of properly handling relationships between tables in a normalized database

// Retrieve data from multiple tables using JOIN query
$query = "SELECT users.username, orders.order_date FROM users JOIN orders ON users.id = orders.user_id";
$result = mysqli_query($connection, $query);

// Loop through the results
while ($row = mysqli_fetch_assoc($result)) {
    echo "Username: " . $row['username'] . " - Order Date: " . $row['order_date'] . "<br>";
}

Keywords

SQL injection data validation foreign key constraints transactions PDO.

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