What are the potential pitfalls of using the SELECT * statement in PHP MySQL queries, and how can it impact the performance of the code?

Using the SELECT * statement in PHP MySQL queries can impact performance by retrieving unnecessary columns, leading to increased memory usage and slower query execution. It is considered a bad practice as it can make the code less maintainable and prone to errors if the table schema changes. To improve performance and maintainability, it's recommended to explicitly specify the columns to retrieve in the SELECT statement. 

<?php
// Explicitly specify the columns to retrieve instead of using SELECT *
$query = "SELECT column1, column2, column3 FROM table_name";
$result = mysqli_query($connection, $query);

// Fetch and process the results
while ($row = mysqli_fetch_assoc($result)) {
    // Process each row
}

// Free the result set
mysqli_free_result($result);

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

Keywords

SELECT * PHP MySQL performance code

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