mysql学习打卡day19

今日成果：

update invoices
set payment_total = invoice_total *0.5,payment_date = due_date
where invoice_id = 1;
-- 更新单行记录 

update orders
set comments = '金牌顾客'
where customer_id in (select customer_id from customers where points > 3000);
-- 更新多条记录

delete from invoices
where invoice_id = 1;
-- 删除某条记录

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