elimina tutti i record dalla tabella
DELETE FROM table_name;
elimina tutte le righe dalla tabella mysql
-- Quick, no possible rollback
TRUNCATE TABLE my_table;
-- With rollback
DELETE FROM my_table;
COMMIT;
sql elimina riga dalla tabella
DELETE FROM table_name WHERE condition;
elimina query
public function deletedata(){
$this->db->where('id', 2);
$this->db->delete('table_name');
}