group_concat sqlite和順序

Question

我想在sqlite3中的group_concat內部進行排序。這不是因爲它是MySQL的方式支持，所以我不能做到這一點：

group_concat(logID order by logDateTime DESC) 

我的全查詢是在這裏，我需要LOGID由logDateTime訂購。我在這裏閱讀了子查詢方法：Sqlite group_concat ordering，但我無法在我的查詢中找到它。

SELECT logID, 
     NULL AS sessionID, 
     logDateTime, 
     NULL AS sessionName, 
     NULL AS NamesInRandomOrder 
FROM logs 
WHERE sessionID IS NULL 

UNION ALL 

SELECT NULL, 
     sessions.sessionID, 
     MAX(logDateTime), 
     sessions.sessionName, 
     group_concat(logID) 
FROM logs 
JOIN sessions ON logs.sessionID = sessions.sessionID 
GROUP BY sessions.sessionID 

ORDER BY 3 DESC 

Answer 1

此訂單子查詢，但SQLite不保證該順序仍然在所有情況下：

SELECT logID, 
     NULL AS sessionID, 
     logDateTime, 
     logName, 
     NULL AS NamesInRandomOrder 
FROM logs 
WHERE sessionID IS NULL 

UNION ALL 

SELECT NULL, 
     sessionID, 
     MAX(logDateTime), 
     sessionName, 
     group_concat(logName) 
FROM (SELECT sessions.sessionID AS sessionID, 
      logDateTime, 
      sessionName, 
      logName 
     FROM logs JOIN sessions ON logs.sessionID = sessions.sessionID 
     ORDER BY sessions.sessionID, 
       logName) 
GROUP BY sessionID 

ORDER BY 3 DESC 

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