MySQL汇总数据

数据表格，创造数据都在上篇文章MySQL常用语句里，可以在我的栏目里看到。

这篇写MySQL汇总数据

求产品价格的平均数

select avg(prod_price) as avg_price from products;

求顾客总数

select count(*) as num_cust from Customers;

求有电子邮件的顾客总数

select count(cust_email) as num_cust from Customers;

返回价格最大值

select max(prod_price) as max_price from products;

返回价格最小值

select min(prod_price) as min_price from products;

求20005的订单数量总数

select sum(quantity) as items_ordered from orderItems where order_num=20005;