What best practices should be followed when updating values in one table based on values from another table in PHP?

When updating values in one table based on values from another table in PHP, it is best practice to use a SQL query with a JOIN clause to link the two tables together and update the desired values accordingly. This ensures that the values are updated accurately and efficiently. 

<?php
// Connect to the database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Update values in table1 based on values from table2
$sql = "UPDATE table1
        JOIN table2 ON table1.id = table2.id
        SET table1.column1 = table2.column1,
            table1.column2 = table2.column2
        WHERE table1.id = 1";

if ($conn->query($sql) === TRUE) {
    echo "Values updated successfully";
} else {
    echo "Error updating values: " . $conn->error;
}

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

Keywords

SQL JOIN UPDATE PHP database

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