MySQL 1064 error in CodeIgniter?

Question

I have query

INSERT INTO subscriptions ( client_id, name, group_id, type ) 
SELECT clients.id, 'Индивидуал', 0, 1 FROM clients WHERE clients.individual=1;
ALTER TABLE clients DROP COLUMN clients.individual;
ALTER TABLE finance_operations ADD COLUMN sub_id INT NOT NULL DEFAULT 0;

which works fine in Mysql Workbench. But if I use it in codeIgniter code:

$this->db->simple_query($query);

I get error 1064:

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'ALTER TABLE clients DROP COLUMN clients.individual; ALTER TABLE' at line 4

Answer 1

PDO can not run more than one question one time; This code is right:

$array = [ "query1", "query2", "query3" ];
foreach($array as $query)
    $this->db->simple_query($query);