create table oc_gestion_order_type (
	order_type_key VARCHAR(255) PRIMARY KEY NOT NULL,
	order_type_label VARCHAR(255) DEFAULT ''
);

insert into oc_gestion_order_type(order_type_key,order_type_label) VALUES 
('DEVIS','Devis commande'),
('PURCHASE','Achat de produit');

alter table oc_gestion_orders 
add column fk_order_type_key VARCHAR(255)  NOT NULL DEFAULT 'DEVIS';

alter table oc_gestion_orders
add column fk_devis_id INT DEFAULT NULL;