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引用：http://blog.csdn.net/kakane/article/details/7401111
【1】建立员工档案表
要求字段：员工员工编号，员工姓名，性别，工资，email，入职时间，部门。
【2】合理选择数据类型及字段修饰符，要求有NOT NULL，auto_increment, primary key等。
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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;
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- mysql> alter table workers_info ADD sex enum(‘F‘,‘M‘,‘S‘);
【3】查看表的结构
- mysql> desc workers_info;
【4】新增qq和tel字段，要求tel字段位于email前，要求入职时间是最后一个字段
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字段修改成mailbox
mysql> ALTER TABLE workers_info CHANGE email mailbox varchar(30);
【6】向表里添加10条记录
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】修改其中两条记录的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】查看所添加记录
mysql> select * from workers_info;
【9】查看姓名和入职时间记录
mysql> select workername,EmployedDates from workers_info;
【10】查询入职时间在2003年以前的
- mysql> select * from workers_info where year(EmployedDates) < 2003;
【11】查询工资最高和最低的员工姓名
- mysql> select * from workers_info ORDER BY salary limit 1;
- mysql> select * from workers_info ORDER BY salary desc limit 1;
【12】查询平均工资
- mysql> select avg(salary) from workers_info;
【13】统计男员工人数、女员工人数
- mysql> select count(男) from workers_info where sex="M";
- mysql> select count(男) from workers_info where sex="M";
【14】按照入职时间先后进行排序，并显示前5位员工姓名
- mysql> select * from workers_info ORDER BY EmployedDates limit 5;
【mysql】mysql 常用建表语句
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原文地址：http://www.cnblogs.com/Unrmk-LingXing/p/5190872.html
