同一 select 查询中的 Hive 查询条件语句

Question

有没有办法在一个单独的配置单元查询中进行 if-else 类型的设置。

在我下面的数据中，我想确保如果 Model 为空或带有“-”，我会用 Device 填充 Final 列，否则它应该填充 Model

My data is something like this 

Device  Model 
iPhone  6SPlus  
Samsung -     

Output I want is 
Device  Model   Final
iPhone  6SPlus  6SPlus
Samsung -      Samsung

I am trying a case statement like this but this isn't working.
CASE
       select Device,Model,length(Model) <3 then Device as Final
       else select Device,Model,Model as Final
END

有人可以帮忙吗？

Answer 1

了解 CASE operator syntax。

select device, model, 
       case when length(model) <3 then Device else model end as Final
  from my_table;