What is the difference between using INSERT and UPDATE statements in MySQL when updating a table with new data in PHP?

When updating a table with new data in MySQL using PHP, the key difference between using INSERT and UPDATE statements lies in whether you are adding new records or updating existing records. If you want to add new records to the table, you should use the INSERT statement. This will insert a new row into the table with the specified data. On the other hand, if you want to update existing records in the table with new data, you should use the UPDATE statement. This will modify the existing records in the table with the specified data.

// Using INSERT statement to add new records to a table
$sql = "INSERT INTO table_name (column1, column2, column3) VALUES ('value1', 'value2', 'value3')";
$result = mysqli_query($connection, $sql);

// Using UPDATE statement to update existing records in a table
$sql = "UPDATE table_name SET column1 = 'new_value1', column2 = 'new_value2' WHERE condition";
$result = mysqli_query($connection, $sql);