MySQL創建和操作數據庫表demo，mysqldemo

MySQL創建和操作數據庫表demo，mysqldemo

【1】建立員工檔案表
要求字段：員工員工編號，員工姓名，性別，工資，email，入職時間，部門。

【2】合理選擇數據類型及字段修飾符，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】查看表的結構

  mysql> desc  workers_info;

【4】新增qq和tel字段，要求tel字段位於email前，要求入職時間是最後一個字段------添加字段

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------修改字段名

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

【6】向表裡添加10條記錄------添加數據

mysql> INSERT INTO workers_info (workername,salary,tel,mailbox,department,qq,EmployedDates) values('xing',10000,'1598232123','[email protected]','yanfa',736019646,20121221);

【7】修改其中兩條記錄的tel和mailbox------修改數據

mysql> UPDATE workers_info SET mailbox = '[email protected]',tel='1246543423' WHERE id = 13;

【8】查看所添加記錄------查詢數據

mysql> select * from workers_info;

【9】查看姓名和入職時間記錄

mysql> select workername,EmployedDates from workers_info;

【10】查詢入職時間在2003年以前的------日期篩選

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

【11】查詢工資最高和最低的員工姓名------排序

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------平均函數

mysql> select avg(salary) from workers_info;

【13】統計男員工人數、女員工人數------總和函數

mysql> select count(1) from workers_info where sex="M";

【14】按照入職時間先後進行排序，並顯示前5位員工姓名

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

版權出自：http://blog.csdn.net/kakane/article/details/7401111