如何在查询结果中重命名列名如“ Customer Full Name”呢

怎么在查询结果中重命名列名如“ Customer Full Name”呢？
如题，怎么把列名重命名成题目里的样子呢？

[解决办法]
select first_name || last_name as "用户 姓名"
from employess;

别名中间有空格时，需要用""引起来。
[解决办法]

SQL code

select sysdate "what time is it" from dual;