sql - Hive 中的嵌套案例语句

Question

有人知道为什么这段代码不起作用吗？

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

或者有更简单的方法吗？我在 proc sql 语句中编写它并将其推送到 Hadoop(因此它需要与 HiveQL 兼容)。

Answer 1

使用 AND 或 OR 子句将嵌套的 Case 语句组合成一个 case 语句。这将起作用。