查詢員工表倒數第三入職日期的所有員工，要考慮到有同一天入職的員工，所以使用去重先查出倒數第三日期，再使用這個日期去查詢所有相等的員工信息

SELECT     *FROM     `employees`WHERE     `hire_date` = (         SELECT DISTINCT             `hire_date`         FROM             `employees`         ORDER BY             `hire_date` DESC         LIMIT 2,         1)

CREATE

drop table if exists `employees`;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,)

INSERT

INSERT INTO `employees` (     `emp_no`,     `birth_date`,     `first_name`,     `last_name`,     `gender`,     `hire_date`)VALUES     (         1,         '2021-08-04',         'Georgi',         'Facello',         'M',         '1980-06-21'     );INSERT INTO `employees` (     `emp_no`,     `birth_date`,     `first_name`,     `last_name`,     `gender`,     `hire_date`)VALUES     (         2,         '2021-08-20',         'Bezalel',         'Simnel',         'F',         '1985-11-21'     );INSERT INTO `employees` (     `emp_no`,     `birth_date`,     `first_name`,     `last_name`,     `gender`,     `hire_date`)VALUES     (         3,         '2021-08-20',         'Parto',         'Bamford',         'M',         '1986-08-28'     );INSERT INTO `employees` (     `emp_no`,     `birth_date`,     `first_name`,     `last_name`,     `gender`,     `hire_date`)VALUES     (         4,         '2021-08-20',         'Chirstian',         'Koblick',         'M',         '1986-12-01'     );

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