What are the potential pitfalls of using INNER JOIN in PHP MySQL queries?

Using INNER JOIN in PHP MySQL queries can lead to potential pitfalls such as returning fewer results than expected if there are no matching records in the joined table. To avoid this issue, you can use LEFT JOIN instead, which will return all records from the first table and matching records from the second table. 

$query = "SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.table1_id";
$result = mysqli_query($connection, $query);

if(mysqli_num_rows($result) > 0) {
    while($row = mysqli_fetch_assoc($result)) {
        // Process the retrieved data
    }
} else {
    echo "No matching records found.";
}

Keywords

INNER JOIN PHP MySQL queries pitfalls

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