Hive中嵌套的Case语句

Question

有没有人有关于此代码无法工作的想法？

create table2 as 
select 
    *, 
    1 as count, 
    case 
     when a=1 then 
      case 
       when tx="A_L" then "L" 
       when tx="B_A" then "A" 
       when tx="C_E" then "E" 
       when tx in ("E_V","D_M","H_O","I_D") then "Other" 
       when tx="F_S" then "S" 
       when tx="G_L" then "L" 
      end 
     when b=1 then 
      case 
       when tx="A_L" then "L" 
       when tx="B_A" then "A" 
       when tx="C_E" then "E" 
      end 
     else 
      case 
       when tx="A_L" then "L" 
       when tx="B_A" then "A" 
       when tx="C_E" then "E" 
       when tx in ("D_M","E_V","F_S","H_O","I_D") then "Other" 
       when tx="G_L" then "L" 
      end 
    end as tx1 
from table1 

还是有更简单的方法来做到这一点？我正在写一个proc sql语句并将其推送到Hadoop（所以它需要与HiveQL兼容）。

Answer 1

使用AND或OR子句将嵌套Case语句组合成一个case语句。这将起作用。