What are the potential pitfalls of using the * wildcard in a SELECT statement in PHP?

Using the * wildcard in a SELECT statement can potentially retrieve more data than needed, leading to decreased performance and unnecessary data transfer. To avoid this issue, it is recommended to explicitly list the columns needed in the SELECT statement. 

// Explicitly list the columns needed in the SELECT statement
$sql = "SELECT column1, column2, column3 FROM table_name WHERE condition";
$result = mysqli_query($conn, $sql);

// Fetch the data
while ($row = mysqli_fetch_assoc($result)) {
    // Process the data
}

Keywords

wildcard SELECT statement PHP potential pitfalls error types

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