SUM和GROUP BY Splice中的子串（NoSql）

Question

我試圖運行下面的查詢。目標是獲得每user_key總活動數，但因爲user_key有一個複雜的結構，我只需要'|'之後的部分。符號我不得不使用子字符串函數。然而，當我試圖運行查詢，我得到的 錯誤：

SQL Error [42Y36]: Column reference 'USER_KEY' is invalid, or is part of an invalid expression. For a SELECT list with a GROUP BY, the columns and expressions being selected may only contain valid grouping expressions and valid aggregate expressions. 

的子功能的工作原理確定此查詢之外。有關此問題的任何解決方法？使用熔接機（的NoSql）

SELECT 
    substr(user_key, instr(user_key,'|') + 1) AS new_user_key, 
    SUM(
     CAST(
      activity_count AS INTEGER 
     ) 
    ) AS Total 
FROM 
    schema_name.table_name 
GROUP BY 
substr(user_key, instr(user_key,'|') + 1) 

Answer 1

你GROUP BY列需要相匹配的SELECT

SELECT 
    substr(user_key, instr(user_key,'|') + 1) AS new_user_key, 
    SUM(
     CAST(
      activity_count AS INTEGER 
     ) 
    ) AS Total 
FROM 
    schema_name.table_name 
GROUP BY 
    substr(user_key, instr(user_key,'|') + 1) AS new_user_key 

Answer 2

，我發現自己的答案。我用一個表子查詢：

SELECT new_table.new_user_key, sum(new_table.total) 
from 
    (
    SELECT 
     substr(user_key, instr(user_key,'|') + 1) AS new_user_key, 
     CAST(activity_count AS INTEGER) AS Total 
    FROM schema_name.table_name 
    ) 
    as new_table 
GROUP BY 
new_table.new_user_key 

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