创建数据库company

create database company charset=utf8;

use company;

company.employee 员工id id int 姓名 emp_name varchar 性别 sex enum 年龄 age int 入职日期 hire_date date 岗位 post varchar 职位描述 post_comment varchar 薪水 salary double 办公室 office int 部门编号 depart_id int

#创建表

create table employee(id int not null unique auto_increment,name varchar(20) not null,sex enum(‘male‘,‘female‘) not null default ‘male‘, age int(3) unsigned not null default 28,hire_date date not null,post varchar(50),post_comment varchar(100),salary double(15,2),office int, depart_id int);

#查看表结构

mysql> desc employee;+--------------+-----------------------+------+-----+---------+----------------+| Field | Type | Null | Key | Default | Extra |+--------------+-----------------------+------+-----+---------+----------------+| id | int(11) | NO | PRI | NULL | auto_increment || name | varchar(20) | NO | | NULL | || sex | enum(‘male‘,‘female‘) | NO | | male | || age | int(3) unsigned | NO | | 28 | || hire_date | date | NO | | NULL | || post | varchar(50) | YES | | NULL | || post_comment | varchar(100) | YES | | NULL | || salary | double(15,2) | YES | | NULL | || office | int(11) | YES | | NULL | || depart_id | int(11) | YES | | NULL | |+--------------+-----------------------+------+-----+---------+----------------+10 rows in set (0.24 sec)

#插入记录 #三个部门：教学，销售，运营

insert into employee(name,sex,age,hire_date,post,salary,office,depart_id) values(‘alex‘,‘male‘,78,‘20150302‘,‘teacher‘,1000000.31,401,1),(‘yuanhao‘,‘male‘,73,‘20140701‘,‘teacher‘,3500,401,1),(‘liwenzhou‘,‘male‘,28,‘20121101‘,‘teacher‘,2100,401,1),(‘jingliyang‘,‘female‘,18,‘20110211‘,‘teacher‘,9000,401,1),(‘jinxin‘,‘male‘,18,‘19000301‘,‘teacher‘,30000,401,1),(‘成龙‘,‘male‘,48,‘20101111‘,‘teacher‘,10000,401,1),(‘歪歪‘,‘female‘,48,‘20150311‘,‘sale‘,3000.13,402,2),#以下是销售部门(‘丫丫‘,‘female‘,38,‘20101101‘,‘sale‘,2000.35,402,2),(‘丁丁‘,‘female‘,18,‘20110312‘,‘sale‘,1000.37,402,2),(‘星星‘,‘female‘,18,‘20160513‘,‘sale‘,3000.29,402,2),(‘格格‘,‘female‘,28,‘20170127‘,‘sale‘,4000.33,402,2),(‘张野‘,‘male‘,28,‘20160311‘,‘operation‘,10000.13,403,3), #以下是运营部门(‘程咬金‘,‘male‘,18,‘19970312‘,‘operation‘,20000,403,3),(‘程咬银‘,‘female‘,18,‘20130311‘,‘operation‘,19000,403,3),(‘程咬铜‘,‘male‘,18,‘20150411‘,‘operation‘,18000,403,3),(‘程咬铁‘,‘female‘,18,‘20140512‘,‘operation‘,17000,403,3);

#ps：如果在windows系统中，插入中文字符，select的结果为空白，可以将所有字符编码统一设置成gbk

#简单查询

SELECT id,name,sex,age,hire_date,post,post_comment,salary,office,depart_id FROM employee; SELECT * FROM employee; SELECT name,salary FROM employee;

查看有哪些职位

mysql> select post from employee;+-----------+| post |+-----------+| teacher || teacher || teacher || teacher || teacher || teacher || sale || sale || sale || sale || sale || operation || operation || operation || operation || operation |+-----------+16 rows in set (0.00 sec)

#避免重复DISTINCT

mysql> select distinct post from employee;+-----------+| post |+-----------+| teacher || sale || operation |+-----------+3 rows in set (0.00 sec)