Whence the error at SQL request undertook?

Question

PHP

try {
        
        $dsn = "mysql:host=localhost;dbname=main";
        $opt = array(
        
          PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
          PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC
          
        );
        
        $DBH = new PDO($dsn, "root", "pass", $opt);
        
          $STH = $DBH->prepare("INSERT INTO users (username, date) VALUES(smellyshovel,5)");

        
          $STH->execute();
        
        $answer = $STH->fetch();
        print $answer;
        
      } catch(PDOException $e) {  
        print($e->getMessage());
      }
      
      $DBH = null;

I ask you not to find fault with the quality, as it was copied from a very old project.
So for some reason it throws an error when executing

SQLSTATE[42S22]: Column not found: 1054 Unknown column 'smellyshovel' in 'field list'

smellyshovel is a database user with root permissions.
I also tried to send a request from root (in this case, there was not a single word about smellyshovel in the script), but it still makes the same error.

Answer 1

Very stupid:
What fetch () can be with an INSERT query? XD

Answer 2

Column not found : 1054 Unknown column 'smellyshovel' in 'field list'
check the database for fields or the correct field name in the query.

Answer 3

where does $what come from? there is a feeling that it was there that "smellyshovel" turned out to be, it is not clear why the truth is, because this error is explicit when trying to execute select.