摘要: --单行函数(左边为原始状态,右边为修改后的状态,每一个字符都大写)select last_name,upper(last_name) from employees; --单行函数select last_name,upper(last_name),lower(last_name) from empl 阅读全文
posted @ 2016-08-27 13:57 叨客人 阅读(807) 评论(0) 推荐(0) 编辑