牛客网sql在线编程练习

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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`));

• 查找最晚入职员工的所有信息

  select * from employees
  order by hire_date desc
  limit 1;

  select * from employees
  where hire_date = 
  (select max(hire_date) from employees);

• 查找入职员工时间排名倒数第三的员工所有信息

  select * from employees
  where hire_date = 
  (select hire_date from employees
  group by hire_date
  order by hire_date desc
  limit 2, 1);

  select * from employees
  where hire_date = 
  (select distinct hire_date from employees
  order by hire_date desc
  limit 2, 1);