Mysql基础第十三天,创建计算字段

Posted 2021-07-06 2019ab

计算字段

	select prod_id,quantity,item_price*100 as expanded_price from orderitems;

拼接字段

	select concat(vend_name,'(',vend_country,')') from vendors;

使用别名

select concat(vend_name,vend_country) as name_country from vendors; // 使用别名
	select concat(vend_name,vend_country) name_country from vendors; // 可以不加as

执行算数计算

	select item_price*100 as expanded_price from orderitems;