课程资料网盘链接：https://pan.baidu.com/s/1-jOwaXWArtv8h21B0-uWGg 提取码：wsra
SQL零基础入门笔记：https://www.mubucm.com/doc/4VC7JuHlj6H
云端数据库安装文档：https://share.mubu.com/doc/rBUGcUie8H
Python安装文档：https://www.mubucm.com/doc/4DJ8YNSNz4F
1. 通配符
SELECT name, continent, population FROM world where name like '_t%'
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SELECT name, continent, population FROM world where name like '__t%'
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SELECT name, continent, population FROM world where name like '%o__o%'
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