mysql学习打卡day18

今日成果：

insert into orders(customer_id,order_date,status)
values(1,'2019-01-02',1);
-- 插入一条新数据
select last_insert_id();
-- 获取新订单的id
insert into order_items
values(last_insert_id(),1,1,2.96);
-- 插入新订单的数据
create table invoices_archeives 
select i.invoice_id,i.number,c.name as client,invoice_date from invoices i
left join clients c on c.client_id = i.client_id
where i.payment_date is not null;
-- 创建表复制：从一张表复制数据到另外一张表

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