方法一:使用ORDER BY对入职时间进行逆序排序,结合LIMIT选取下标为2的那条记录即可。LIMIT 2,1 = LIMIT 1 OFFSET 2

SELECT *
FROM employees
ORDER BY hire_date DESC
LIMIT 1 OFFSET 2

方法二:如果有多名并列第三的员工可以使用下面的语句

SELECT *
FROM employees
WHERE hire_date=(SELECT hire_date
                 FROM employees
                 ORDER BY hire_date DESC
                 LIMIT 1 OFFSET 2)