create table oc_gestion_client_group (
	id INT PRIMARY KEY AUTO_INCREMENT,
	client_group_name VARCHAR(255) DEFAULT ''
);

alter table oc_gestion_client 
add column fk_client_group_id INT NULL;

create table oc_gestion_client_group_discount(
	id INT PRIMARY KEY AUTO_INCREMENT,
	fk_client_group_id INT NOT NULL,
	fk_produit_id INT NOT NULL,
	ht_amount FLOAT NOT NULL DEFAULT 0
);