supprimer tous les enregistrements de la table
DELETE FROM table_name;
comment supprimer une ligne dans sql
delete from TableName where condition;
delete from scrumteam where firstname='Jack';
delete from scrumteam where JobTitle='SDET';
supprimer la requête
public function deletedata(){
$this->db->where('id', 2);
$this->db->delete('table_name');
}