Impala中使用SELECT语句的算术运算

Question

我正在编写一个需要GROUP BY行类型的查询，并将该值除以总计以了解IMPALA中的总百分比。 例：

Name                           performance
something type1 something           15
something type1 something           18
something type2 something           23
something something something       345
something type2 something           23

SELECT
CASE WHEN name like '%type1%' then 'type 1'
    WHEN name like '%type2%' then 'type2'
    ELSE 'other' END as type
,sum(performance) / (SELECT sum(performance) FROM table)
FROM table
GROUP BY type 

这给了我一个AnalysisException错误：选择列表中不支持子查询。 任何人都可以建议我如何解决这个问题？

Answer 1

我认为它只需要＆＃34;（）＆＃34;

SELECT
(CASE WHEN name like '%type1%' then 'type 1'
    WHEN name like '%type2%' then 'type2'
    Else 'other' END) as type
,sum(performance) / (SELECT sum(performance) FROM table)
FROM Table
GROUP BY type