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--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 employees;
--多行函数(计数)
select count(last_name)from employees;
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原文地址:http://www.cnblogs.com/q827418266/p/5812924.html