Question

我有这个问题：

WITH RECURSIVE cte(Id, Type, ParentId, CreationDate, SenderId, Message) AS 
(
  SELECT c.* FROM (SELECT Id, Type, ParentId, CreationDate, SenderId, Message
                   FROM GroupMessage
                   WHERE GroupId = '4a80590e-036c-45b6-a512-be0d8e48fbb6'
                     AND ParentId is NULL
                   ORDER BY CreationDate DESC
                   LIMIT 20 OFFSET 0) as c
  UNION
  SELECT c.Id, cte.Type+1, c.ParentId, c.CreationDate,  c.SenderId, c.Message
  FROM cte, GroupMessage c
  WHERE c.ParentId = cte.Id AND c.Type = '1'
  ORDER BY CreationDate DESC
)

SELECT * FROM cte

目前，我将父信息的数量限制为最近的20条。我怎么能把孩子的数量限制在最近的5或10个？我尝试在UNION ORDER BY之后添加LIMIT关键字，但整个查询只返回5或10行。此外，OPTION关键字在Sqlite3中不可用，而且我的想法已经用完了。

sqlite3限制cte递归

0 个答案: