sqlite - 带左联接的SQLITE排序group_concat

Question

我有以下查询

        let Query = "SELECT LEVELS1.ID, LEVELS1.NAME, GROUP_CONCAT(FRAMEWORKLEVELS1.NAME,'&/?') AS DATA FROM LEVELS1 LEFT JOIN FRAMEWORKLEVELS1 ON LEVELS1.ID = FRAMEWORKLEVELS1.LEVELID WHERE FRAMEWORKID = :ID GROUP BY FRAMEWORKID"

产生以下

DATA = "Level1&/?Level4&/?Level2&/?Level3";
ID = 1;
NAME = "Title";

我要执行的操作是订购GROUP_CONCAT，但是如何在SQLITE中执行此操作？

我找到了以下链接

Sqlite group_concat ordering

但我不知道如何在其中加入左联接

谢谢

Answer 1

只需获取所需的所有数据，对其进行排序，然后对其进行汇总：

SELECT ID,
       Name,
       group_concat(LevelName, '&/?') AS Data
FROM (SELECT Levels1.ID AS ID,
             Levels1.Name AS Name,
             FrameworkLevels1.Name AS LevelName
      FROM Levels1
      LEFT JOIN FrameworkLevels1 ON Levels1.ID = FrameworkLevels1.LevelID
      WHERE FrameworkID = :ID
      ORDER BY ...);