2021-11-26 SQL学习3

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

select sum(population) 人口总数 from world where continent = 'Africa'

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select sum(population) 人口总数, avg(population) 平均, max(population), min(population) from world where continent = 'Africa'