标签：教程 CN USA www https SQL null com
SELECT语句
-- Websites:
+----+--------------+---------------------------+-------+---------+
| id | name | url | alexa | country |
+----+--------------+---------------------------+-------+---------+
| 1 | Google | https://www.google.cm/ | 1 | USA |
| 2 | 淘宝 | https://www.taobao.com/ | 13 | CN |
| 3 | 菜鸟教程 | http://www.runoob.com/ | 4689 | CN |
| 4 | 微博 | http://weibo.com/ | 20 | CN |
| 5 | Facebook | https://www.facebook.com/ | 3 | USA |
+----+--------------+---------------------------+-------+---------+
create table 'Websites' (
id int not null primary key auto_increment,
name char(20) not null,
url varchar(40) null,
alexa int null,
country char(10) null
)default charset = utf8;
insert into Websites
values
(1, 'Google', 'https://www.google.com/', 1, 'USA'),
(2, '淘宝', 'https://www.taobao.com/', 13, 'CN'),
(3, '菜鸟', 'https://www.runoob.com/', 4689, 'CN'),
(4, '微博', 'http://weibo.com/', 20, 'CN'),
(5, 'Facebook', 'https://www.facebook.com/', 3, 'USA')
标签：教程,
CN,
USA,
www,
https,
SQL,
null,
com
From： https://www.cnblogs.com/Aorphine/p/18191010