题解 | 分群并计算群体人数
分群并计算群体人数
https://www.nowcoder.com/practice/24319fd5c03e482c935783107114933d
select if(age<20,"20以下",if(age>50,"50以上", if(age is null,"未填写","20-50"))) age_group,count(1) user_count from customers_info group by age_group
分群并计算群体人数
https://www.nowcoder.com/practice/24319fd5c03e482c935783107114933d
select if(age<20,"20以下",if(age>50,"50以上", if(age is null,"未填写","20-50"))) age_group,count(1) user_count from customers_info group by age_group
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rbjjj:太杂了吧,同学,项目似乎都没深度,都是api调度耶,分层架构思想没有体现出来了,前端没有前端优化前端工程化体现,后端微服务以及分层架构没体现以及数据安全也没体现,核心再改改,注重于计算机网络,工程化,底层原理吧