Postgresql Postgres查询按月和年分组的总计数

以下是数据表--

 del_no  |   Pkt   | direction  |  Env  | start_datetimestamp |
---------+---------+------------+-------+---------------------+
 H_00002 |  02     |  SOUTH     | PROD  | 2022-10-29 16:20:57 |
 E20     |  20     |  NORTH     | PROD  | 2022-10-30 16:41:37 |
 H_00002 |  02     |  NORTH     | TEST  | 2022-10-30 17:21:17 |
 E20     |  20     |  SOUTH     | DEV   | 2022-10-30 17:30:24 |
 H_00004 |  02     |  NORTH     | PROD  | 2022-10-30 16:52:48 |
 H_00004 |  02     |  SOUTH     | PROD  | 2022-10-30 19:03:36 |
 H_00007 |  02     |  NORTH     | PROD  | 2022-10-30 20:52:48 |
 H_00007 |  02     |  SOUTH     | PROD  | 2022-10-30 21:03:36 |
 H_00015 |  02     |  SOUTH     | TEST  | 2022-11-13 19:11:10 |
 L 0013  |  13     |  NORTH     | PROD  | 2022-11-14 20:06:46 |
 H_00015 |  02     |  NORTH     | TEST  | 2022-11-15 20:17:40 |
 L0021   |  21     |  SOUTH     | TEST  | 2022-11-15 20:56:18 |
 H_00015 |  02     |  NORTH     | PROD  | 2022-11-15 20:17:40 |
 L0027   |  21     |  SOUTH     | DEV   | 2022-11-30 20:56:18 |
 H_00019 |  02     |  NORTH     | PROD  | 2022-11-30 20:17:40 |
 L0023   |  21     |  SOUTH     | TEST  | 2022-11-30 20:56:18 |
 H_00019 |  02     |  SOUTH     | TEST  | 2022-11-30 20:17:40 |
 L0025   |  21     |  SOUTH     | TEST  | 2022-11-30 20:56:18 |
 H_00019 |  02     |  SOUTH     | DEV   | 2022-11-30 20:17:40 |
 H_00018 |  02     |  SOUTH     | PROD  | 2023-10-31 20:17:40 |
 H_00018 |  02     |  NORTH     | PROD  | 2023-11-02 03:17:40 |
 H_00033 |  02     |  SOUTH     | PROD  | 2023-10-31 20:17:40 |
 H_00033 |  02     |  NORTH     | DEV   | 2023-11-02 03:17:40 |

我想数一下以下条件下的子弹数-

1- Filter by Pkt where Pkt = 02 only.
2- Group by 'del_no' (consider NORTH and SOUTH one complete round), then counts all the rounds by monthly and yearly.
3- Segregate the counts based on Env. (e.g. 1st and 3rd row is one complete round and both has PROD and TEST env so that one count should be in PROD/TEST Env, same goes for other).
4- If same del_no(H_00018) starts on another month and end on next month so the count should be added in start month.

输出-

Month   |       Env     | Counts |
--------+---------------+--------+
2022-10 | PROD/TEST     |  1     |
2022-10 | PROD          |  2     |
2022-11 | PROD/TEST     |  1     |
2022-11 | PROD/TEST/DEV |  1     |
2023-10 | PROD          |  1     |
2023-10 | PROD/DEV      |  1     |

以下查询在第4个条件下不起作用-

select "Month",sum(rounds)"Counts","Env" from (
    select del_no,
           to_char(start_datetimestamp,'YYYY-MM') "Month",
           least( count(*)filter(where direction='SOUTH')
                 ,count(*)filter(where direction='NORTH')) rounds,
           string_agg(distinct env,'/' order by env) "Env"
    from tablename where pkt='2' group by del_no,2)
group by "Month","Env";

https://dbfiddle.uk/FGIzl6hy个