mysql内连接怎么写

连接分为：内连接、外连接、交叉连接。今天我们来学习一下，如何用mysql建立内连接。

内连接定义：仅将两个表中满足连接条件的行组合起来作为结果集。 

关键词：INNER JOIN 

select * from employees e inner join department d 
on e.employee_id = d.department_id  where e.employee_id = "1";

等价于

select * from employees e,department d 
where e.employee_id = d.department_id and e.employee_id = "1";