What is the difference between INSERT and UPDATE statements in MySQL and how can they be correctly implemented in PHP scripts?

The main difference between INSERT and UPDATE statements in MySQL is that INSERT is used to add new records to a table, while UPDATE is used to modify existing records. To correctly implement these statements in PHP scripts, you need to establish a database connection, construct the SQL query with the appropriate statement, and execute the query using PHP's mysqli functions. 

// Establishing a connection to the database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database_name";

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

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

// INSERT statement example
$sql = "INSERT INTO table_name (column1, column2) VALUES ('value1', 'value2')";
if ($conn->query($sql) === TRUE) {
    echo "New record created successfully";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

// UPDATE statement example
$sql = "UPDATE table_name SET column1 = 'new_value' WHERE condition";
if ($conn->query($sql) === TRUE) {
    echo "Record updated successfully";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

// Closing the connection
$conn->close();

Keywords

MySQL INSERT statement UPDATE statement PHP scripts implementation

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