What are the potential pitfalls of using SELECT * in SQL queries, especially in PHP?

Using SELECT * in SQL queries can lead to performance issues and unnecessary data retrieval, as it fetches all columns from a table even if only a few are needed. This can result in increased network traffic and slower query execution. To address this, it is recommended to explicitly specify the columns needed in the SELECT statement. 

<?php
// Specify the columns needed in the SELECT statement instead of using SELECT *
$query = "SELECT column1, column2, column3 FROM table_name WHERE condition = value";
$result = mysqli_query($connection, $query);

// Process the query result
while ($row = mysqli_fetch_assoc($result)) {
    // Code to handle the retrieved data
}
?>

Keywords

SQL SELECT * PHP security vulnerabilities performance degradation

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