mysql惯用建表语句-转

mysql 常用建表语句 -转 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, prima

mysql 常用建表语句 -转

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。

?

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

alter table workers_info change email mailbox varchar(30);

?【6】向表里添加10条记录

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',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(女) from workers_info where sex="w";

?【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;
【说明】：本文章由站长整理发布，文章内容不代表本站观点，如文中有侵权行为，请与本站客服联系(QQ:254677821)！