What are the potential pitfalls of using "SELECT *" in PHP MySQL queries?

Using "SELECT *" in MySQL queries can lead to performance issues and potential security vulnerabilities. It retrieves all columns from a table, even if they are not needed, which can slow down the query. Additionally, it can make the application more vulnerable to SQL injection attacks if the columns returned are not properly sanitized. To avoid these pitfalls, it is recommended to explicitly specify the columns you want to retrieve in the SELECT statement. 

// Specify the columns you want to retrieve instead of using "SELECT *"
$sql = "SELECT column1, column2, column3 FROM table_name WHERE condition = value";
$result = mysqli_query($connection, $sql);

// Loop through the results
while($row = mysqli_fetch_assoc($result)) {
    // Process the retrieved data
}

Keywords

SELECT * PHP MySQL security performance

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