Sql 按线程路径和总投票数排序注释

我在按线程路径和每条注释的向上投票数排序注释时遇到一些问题

现在它们只按线程路径排序。我已经尝试和搜索了很多东西，但都没有结果

这是我的问题

WITH RECURSIVE first_comments AS (
(
 (
   SELECT id, text, level, parent_id, array[id] AS thread_path, total_votes FROM comments
   WHERE comments."postId" = 1 AND comments."level" = 0 
 )
)
UNION
 (
  SELECT e.id, e.text, e.level, e.parent_id, (fle.thread_path || e.id), e.total_votes
  FROM
  (
    SELECT id, text, level, parent_id, total_votes FROM comments
    WHERE comments."postId" = 1
  ) e, first_comments fle
  WHERE e.parent_id = fle.id
 )
)
SELECT id, text, level, total_votes, thread_path from first_comments ORDER BY 5 ASC

此查询结果为：

--------------------------------------------------
| id  | level  | total_votes |    thread_path    |
--------------------------------------------------
| 1   |   0    |      5      |  {1}              |
| 3   |   1    |      9      |  {1,3}            |
| 7   |   2    |      5      |  {1,3,7}          |
| 9   |   2    |      7      |  {1,3,9}          |
| 11  |   3    |      0      |  {1,3,9,11}       |
| 12  |   4    |      0      |  {1,3,9,11,12}    |
| 13  |   5    |      0      |  {1,3,9,11,12,13} |
| 10  |   1    |     20      |  {1,10}           |
| 2   |   0    |     10      |  {2}              |
| 6   |   1    |      1      |  {2,6}            |
| 4   |   0    |      8      |  {4}              |
| 8   |   1    |      6      |  {4,8}            |
| 5   |   0    |      3      |  {5}              |
--------------------------------------------------

并且结果应该是

--------------------------------------------------
| id  | level  | total_votes |    thread_path    |
--------------------------------------------------
| 2   |   0    |     10      |  {2}              |
| 6   |   1    |      1      |  {2,6}            |
| 4   |   0    |      8      |  {4}              |
| 8   |   1    |      6      |  {4,8}            |
| 1   |   0    |      5      |  {1}              |
| 10  |   1    |     20      |  {1,10}           |              
| 3   |   1    |      9      |  {1,3}            |
| 9   |   2    |      7      |  {1,3,9}          |
| 11  |   3    |      0      |  {1,3,9,11}       |
| 12  |   4    |      0      |  {1,3,9,11,12}    |
| 13  |   5    |      0      |  {1,3,9,11,12,13} |
| 7   |   2    |      5      |  {1,3,7}          |
| 5   |   0    |      3      |  {5}              |
--------------------------------------------------

我错过了什么

---

感谢您的帮助

您想按最高级别的总票数排序。我想我将通过使用窗口函数来实现这一点

而不是：

SELECT id, text, level, total_votes, path
from first_comments
ORDER BY 5 ASC;

它显式地按路径排序。试试这个：

select id, text, level, total_votes,
       max(total_votes) over (partition by path[1]) as toplevel_votes
from first_comments
order by 6 desc;

---

这将计算最高级别的总投票数，并将其用于排序。

只需在路径旁边累积另一个数组，该数组将不仅包含其路径中每个注释的

id

，还包含每个id之前的

total_voces

（作为负数）。之后，您可以按该列排序

WITH RECURSIVE first_comments AS (
(
 (
   SELECT id, text, level, parent_id, array[id] AS path, total_votes,
          array[-total_votes, id] AS path_and_votes
   FROM comments
   WHERE comments."postId" = 1 AND comments."level" = 0 
 )
)
UNION
 (
  SELECT e.id, e.text, e.level, e.parent_id, (fle.path || e.id), e.total_votes,
         (fle.path_and_votes || -e.total_votes || e.id)
  FROM
  (
    SELECT id, text, level, parent_id, total_votes FROM comments
    WHERE comments."postId" = 1
  ) e, first_comments fle
  WHERE e.parent_id = fle.id
 )
)
SELECT id, text, level, total_votes, path from first_comments ORDER BY path_and_votes ASC

---

（仅数据—不带递归CTE）

我删除了MySQL标签，因为MySQL不支持递归CTE。你不应该按4,5或5,4排序吗？我必须承认，我没有看到搜索结果集中的进度。我想我明白了：按路径结果排序回复在注释之后，即“回复到”。但是你想通过

total_vows

？@Gordon，谢谢你，但是pozs确实做到了。还有一个问题，你觉得这个标题合适吗？我发现搜索这些术语非常困难