【1】創(chuàng)建員工檔案表

要求字段：員工員工編號，員工姓名，性別，工資，email，入職時(shí)間，部門。

【2】合理選擇數(shù)據(jù)類型及字段修飾符，要求有NOT NULL，auto_increment, primary key等。

--

-- make by kakane

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DROP TABLE IF EXISTS `workers_info`;

CREATE TABLE `workers_info` (

`id` int(11) NOT NULL AUTO_INCREMENT,

`workername` varchar(20) NOT NULL,

`sex` enum(F,M,S),

`salary` int(11) DEFAULT '0',

`email` varchar(30),

`EmployedDates` date,

`department` varchar(30),

PRIMARY KEY (`id`)

) ENGINE=MyISAM DEFAULT CHARSET=utf8;

mysql> alter table workers_info ADD sex enum('F','M','S');

【3】查看表的結(jié)構(gòu)html

mysql> desc workers_info;

【4】新增qq和tel字段，要求tel字段位于email前，要求入職時(shí)間是最后一個(gè)字段mysql

mysql> ALTER TABLE workers_info ADD tel varchar(15) after salary;

mysql> ALTER TABLE workers_info ADD qq int;

ALTER TABLE workers_info MODIFY EmployedDates date after qq;

【5】把email字段修改為mailbox

mysql> ALTER TABLE workers_info CHANGE email mailbox varchar(30);

【6】向表里添加10條記錄

mysql> INSERT INTO workers_info values(NULL,'xing',10000,'1598232123','xing@qq.com','yanfa',736019646,20121221);

mysql> INSERT INTO workers_info (workername,salary,tel,mailbox,department,qq,EmployedDates) values('xing',10000,'1598232123','xing@qq.com','yanfa',736019646,20121221);

【7】修改其中兩條記錄的tel和mailbox

mysql> UPDATE workers_info SET mailbox = 'haha@qq.com' WHERE id = 14;

mysql> UPDATE workers_info SET mailbox = 'haha@qq.com',tel='1246543423' WHERE id = 13;

【8】查看所添加記錄

mysql> select * from workers_info;

【9】查看姓名和入職時(shí)間記錄

mysql> select workername,EmployedDates from workers_info;

【10】查詢?nèi)肼殨r(shí)間在2003年之前的

mysql> select * from workers_info where year(EmployedDates) < 2003;

【11】查詢工資最高和最低的員工姓名sql

mysql> select * from workers_info ORDER BY salary limit 1;

mysql> select * from workers_info ORDER BY salary desc limit 1;

【12】查詢平均工資

mysql> select avg(salary) from workers_info;

【13】統(tǒng)計(jì)男員工人數(shù)、女員工人數(shù)spa

mysql> select count(男) from workers_info where sex="M";

mysql> select count(男) from workers_info where sex="M";

【14】按照入職時(shí)間前后進(jìn)行排序，并顯示前5位員工姓名

mysql> select * from workers_info ORDER BY EmployedDates limit 5;

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