What are the common pitfalls when using SQL joins in PHP to fetch data from multiple tables?

Common pitfalls when using SQL joins in PHP to fetch data from multiple tables include forgetting to specify the columns to select, not handling duplicate column names properly, and not aliasing columns with the same name. To solve these issues, always specify the columns to select explicitly, use aliases for columns with the same name, and handle duplicate column names by aliasing them. 

$sql = "SELECT users.id AS user_id, users.name AS user_name, orders.id AS order_id, orders.total_amount
        FROM users
        INNER JOIN orders ON users.id = orders.user_id";

$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "User ID: " . $row["user_id"]. " - User Name: " . $row["user_name"]. " - Order ID: " . $row["order_id"]. " - Total Amount: " . $row["total_amount"]. "<br>";
    }
} else {
    echo "0 results";
}

Keywords

SQL joins PHP data fetching multiple tables errors

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