MySQL练习九：查找最晚入职员工的所有信息

有一个员工employees表简况如下:

0BFB4D140D9C3E92AF681D9F9CB92D55

请你查找employees里最晚入职员工的所有信息，以上例子输出如下:

D2ABA1E2F5834850B16146F168AC5476

对应SQL语句:

代码语言：javascript复制

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,
PRIMARY KEY (`emp_no`));

insert 语句

代码语言：javascript复制

INSERT INTO employees VALUES(10001,'1953-09-02','Georgi','Facello','M','1986-06-26');
INSERT INTO employees VALUES(10002,'1964-06-02','Bezalel','Simmel','F','1985-11-21');
INSERT INTO employees VALUES(10003,'1959-12-03','Parto','Bamford','M','1986-08-28');
INSERT INTO employees VALUES(10004,'1954-05-01','Chirstian','Koblick','M','1986-12-01');
INSERT INTO employees VALUES(10005,'1955-01-21','Kyoichi','Maliniak','M','1989-09-12');
INSERT INTO employees VALUES(10006,'1953-04-20','Anneke','Preusig','F','1989-06-02');
INSERT INTO employees VALUES(10007,'1957-05-23','Tzvetan','Zielinski','F','1989-02-10');
INSERT INTO employees VALUES(10008,'1958-02-19','Saniya','Kalloufi','M','1994-09-15');
INSERT INTO employees VALUES(10009,'1952-04-19','Sumant','Peac','F','1985-02-18');
INSERT INTO employees VALUES(10010,'1963-06-01','Duangkaew','Piveteau','F','1989-08-24');
INSERT INTO employees VALUES(10011,'1953-11-07','Mary','Sluis','F','1990-01-22');

参考答案:

代码语言：javascript复制

SELECT * FROM employees where  hire_date = (SELECT hire_date from employees  order by hire_date desc LIMIT 0, 1);

试题解析:

首先明白此题是查询最晚入职的员工，我们直接根据入职日期做一个倒序即可。
倒序得到最晚的入职日期，在到用户表去查询日期等于该日期即可。
此题很容易遗漏，同一天入职的员工不止一个，会存在多个情况。

sql ddl insert

0 人点赞