GROUP_CONCAT或SUM，內部包含Count（*），在MySQL中為GROUP BY

Question

我目前有這個查詢：

SELECT ((count(*) DIV 20) * 10) AS money_earned 
FROM ticket 
WHERE 
    closed_by = 269 AND 
    status = 1 AND
    closed_index >= TO_DAYS("2012/01/01") AND closed_index <= TO_DAYS("2013/01/01")
GROUP BY closed_index;

它產生此：

money_earned

60
50
30
20
20

有沒有辦法對這些行求和，或將結果行連接為字符串。 我嘗試使用GROUP_CONCAT，但收到“無效使用組功能”錯誤。

相反，如果可能的話，我想在一個查詢中產生以下內容：

money_earned
180

要么

money_earned
60,50,30,20,20

Answer 1

您可以將查詢用作子查詢：

select sum(money_earned), group_concat(money_earned)
from (SELECT ((count(*) DIV 20) * 10) AS money_earned 
      FROM ticket 
      WHERE closed_by = 269 AND 
            status = 1 AND
            closed_index >= TO_DAYS("2012/01/01") AND closed_index <= TO_DAYS("2013/01/01")
      GROUP BY closed_index
     ) tci;

由於四舍五入，我將在單個查詢中對此保持警惕。