What is the correct approach to updating database entries without rewriting the entire table in PHP?

When updating database entries in PHP, it is important to use SQL queries that target specific rows or columns rather than rewriting the entire table. This can be achieved by using the UPDATE statement with a WHERE clause that specifies the condition for the update. By doing so, only the relevant entries will be modified, reducing unnecessary processing and improving efficiency. 

<?php
// Connect to the database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";
$conn = new mysqli($servername, $username, $password, $dbname);

// Update a specific entry in the table
$id = 1;
$newValue = "New Value";
$sql = "UPDATE table_name SET column_name = '$newValue' WHERE id = $id";
$conn->query($sql);

// Close the database connection
$conn->close();
?>

Keywords

SQL UPDATE statement database entries PHP efficiency

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