What are some common pitfalls when trying to display data from multiple tables in PHP using MySQL queries?

One common pitfall when trying to display data from multiple tables in PHP using MySQL queries is not properly joining the tables together. To solve this, you need to use the appropriate JOIN clauses in your SQL query to connect the tables based on their relationships. Additionally, make sure to select the columns you need from each table to display the desired data. 

<?php
// Establish a connection to the database
$connection = mysqli_connect("localhost", "username", "password", "database");

// Query to select data from multiple tables using JOIN
$query = "SELECT t1.column1, t2.column2
          FROM table1 AS t1
          JOIN table2 AS t2 ON t1.id = t2.id";

$result = mysqli_query($connection, $query);

// Display the data
while ($row = mysqli_fetch_assoc($result)) {
    echo $row['column1'] . " - " . $row['column2'] . "<br>";
}

// Close the connection
mysqli_close($connection);
?>

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