将employees表的所有员工的last_name和first_name拼接起来作为Name

CREATE TABLE `employees` ( `emp_no` int(11) NOT NULL,
`birth_date` date NOT NULL,
`first_name` varchar(14) NOT NULL,
`last_name` varchar(16) NOT NULL,
`gender` char(1) NOT NULL,
`hire_date` date NOT NULL,
PRIMARY KEY ( `emp_no` ));

select last_name || " " || first_name Name from employees

select concat(last_name," ",first_name) Name from employees