What potential issues could arise from using ORDER BY id DESC in the code?

Using ORDER BY id DESC can potentially lead to performance issues if the table has a large number of rows, as it may require scanning the entire table to sort the results. To solve this, you can add an index on the id column to speed up the sorting process. 

// Add an index on the id column
$sql = "CREATE INDEX id_index ON your_table_name (id)";
$result = mysqli_query($conn, $sql);

// Use the indexed id column in the ORDER BY clause
$sql = "SELECT * FROM your_table_name ORDER BY id DESC";
$result = mysqli_query($conn, $sql);

// Fetch and display the results
while ($row = mysqli_fetch_assoc($result)) {
    echo $row['column_name'] . "<br>";
}

Keywords

ORDER BY id DESC SQL injection performance data integrity

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