supprimer tous les enregistrements de la table
DELETE FROM table_name;
supprimer toutes les lignes de la table mysql
-- Quick, no possible rollback
TRUNCATE TABLE my_table;
-- With rollback
DELETE FROM my_table;
COMMIT;
sql supprime une ligne de la table
DELETE FROM table_name WHERE condition;
supprimer la requête
public function deletedata(){
$this->db->where('id', 2);
$this->db->delete('table_name');
}