What are the benefits of specifying columns instead of using SELECT * in a query that involves joining multiple tables in PHP?

Specifying columns instead of using SELECT * in a query that involves joining multiple tables in PHP can improve performance by reducing the amount of data fetched from the database. It also makes the code more readable and maintainable by explicitly stating which columns are being retrieved. Additionally, it can prevent potential conflicts or ambiguities when columns with the same name exist in multiple tables. 

<?php
// Specify the columns you want to retrieve in the SELECT statement
$query = "SELECT table1.column1, table2.column2, table2.column3 FROM table1 JOIN table2 ON table1.id = table2.id";

// Execute the query and fetch the results
$result = mysqli_query($connection, $query);

// Process the results as needed
while ($row = mysqli_fetch_assoc($result)) {
    // Access the specific columns by their names
    $column1Value = $row['column1'];
    $column2Value = $row['column2'];
    $column3Value = $row['column3'];
}
?>

Keywords

PHP JOIN SELECT columns performance

Related Questions