一、每个学科的成绩第一名是谁？

0 问题描述

 基于学生成绩表输出每个科目的第一名是谁呢？

1 数据准备

with t1 as(select'zs'                                           as name,'[{"Chinese":80},{"Math":70}],{"English":60}]' as score_extunion allselect'ls'                                           as name,'[{"Chinese":90},{"Math":70}],{"English":90}]' as score_extunion allselect'ww'                                           as name,'[{"Chinese":60},{"Math":90}],{"English":80}]' as score_ext),t2 as(selectname,-- 需要把 [] " {} 都给去掉，方面后面操作regexp_replace(score_ext, '\\[|\\{|\\}|\\"|\\]', '') as scoresfrom t1),t3 as (selectname,split(score, ":")[0] as course,split(score, ":")[1] as scorefrom t2lateral view explode(split(scores, ',')) expl as score)selectname,course,score
from (selectcourse,name,score,row_number() over (partition by course order by score desc) as rnfrom t3) t4
where rn = 1;

2 数据分析

3 小结

该题目利用（行转列）炸裂+开窗进行 解决；