行轉列 pivot函式

select VendorId ,
sum(case when  IncomeDay='MoN' then IncomeAmount else 0 end) MON,
sum(case when  IncomeDay='TUE' then IncomeAmount else 0 end) TUE,
sum(case when  IncomeDay='WED' then IncomeAmount else 0 end) WED,
sum(case when  IncomeDay='THU' then IncomeAmount else 0 end) THU,
sum(case when
 
  IncomeDay='FRI' then IncomeAmount else 0 end) FRI,
sum(case when  IncomeDay='SAT' then IncomeAmount else 0 end) SAT,
sum(case when  IncomeDay='SUN' then IncomeAmount else 0 end) SUN
from DailyIncome group by VendorId

select * from DailyIncome
pivot (max (IncomeAmount) for IncomeDay in ([MON],[TUE
 
],[WED],[THU],[FRI],[SAT],[SUN])) as MaxIncomePerDay
where VendorId in ('SPIKE')

這就需要使用到行轉列，注意，這裡需要將括號去掉。

如將useridList->[123,345,234,2334]轉為
123
345
234
2334

select userid2
from
(
select substr(useridList，2，length(useridList)-2) as userid
from a
) t1
lateral view explode(split(userid, ',')) t1 as
 
 userid2

連結：https://zhuanlan.zhihu.com/p/214254848