将employees表中的所有员工的last_name和first_name通过(’)连接起来。
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
));
--sqlite拼接字符串用 ||
select last_name || "'" || first_name as name from employees;
--MySQL用CONCAT()拼接两个字符串