create table xx_order_bak like xx_order;
alter table xx_order_bak add column `unit` int(10) DEFAULT 1;
INSERT INTO xx_order_bak(`id`, `create_date`, `modify_date`, `address`, `amount_paid`)
select * from xx_order;
rename table xx_order to xx_order_bak1;
rename table xx_order_bak to xx_order;
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