使用Impala中的SELECT语句进行算术运算

Question

我正在写一个查询，需要GROUP BY一行的类型，然后将值除以总数，以知道IMPALA中的总数的百分比。 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 

这让我AnalysisException的错误：子查询不在选择列表的支持。 任何人都可以建议我将如何解决这个问题？

Answer 1

我认为只需要 “（）”

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