day1练习

#丢弃数据库，如果存在
DROP DATABASE IF EXISTS xz;
#创建数据库
CREATE DATABASE xz;
#进入该数据库
USE xz;
#创建保存用户的数据的表
CREATE TABLE user(
uid INT,
uname VARCHAR(16),
upwd VARCHAR(132),
email VARCHAR(32),
phone VARCHAR(11),
sex VARCHAR(1), #M/F
userName VARCHAR(6),
registerTime VARCHAR(10),
isOnline VARCHAR(1)

);

#插入数据
INSERT INTO user VALUES
('1','dingding','123456','[email protected]','18112345678','M','张三','2018-10-20','N'),
('2','dangdang','123456','[email protected]','18388888888','F','小芳','2017-12-19','Y'),
('3','jingjing','654321','[email protected]','19912345678','M','建国','2018-6-1','N');

#修改编号为3的数据
UPDATE user SET isOnline='Y',registerTime='2019-3-1' WHERE uid='3';
#删除编号为2的数据
DELETE FROM user WHERE uid='2';

#查询所有用户数据
SELECT * FROM user;