Django Group按查詢？

我正在使用django ORM通過查詢使用組獲取數據。原始PostgreSQL的查詢是 -Django Group按查詢？

select date_trunc('day', time) as Time ,count(status) from table where group_id='2177' and status=1 group by date_trunc('day', time) order by time desc limit 7 offset 0;

和它返回正確的輸出..

 time    | count 
---------------------------+------- 
2017-05-04 00:00:00+05:30 | 12 
2017-05-03 00:00:00+05:30 | 26 
2017-05-02 00:00:00+05:30 | 25 
2017-05-01 00:00:00+05:30 | 26 
2017-04-30 00:00:00+05:30 | 26 
2017-04-29 00:00:00+05:30 | 26 
2017-04-28 00:00:00+05:30 | 26

（7行）

我使用Django的註釋功能來達致這 - 這裏是django查詢 -

records = TableModel.objects.filter(     
         group_id=group_id,           
         status=1,                  
         time__range = get_time_range(range)                  
         ).annotate(
            period=DateTrunc('day', 'time') , 
            count=Count('status') 
           ).annotate(
             period = DateTrunc('day', 'time') 
           ).order_by('-time')

在Debug上，我發現django是我的它nternally轉換爲 -

SELECT "table"."id", "table"."time", "table"."status", "table"."group_id", DATE_TRUNC('day', "table"."time") AS "period", COUNT("table"."status") AS "count" FROM "table" WHERE ("table"."group_id" = '2177' AND "table"."status" = 1 AND "table"."time" BETWEEN '2017-04-28 11:47:21.421755+00:00' AND '2017-05-05 11:47:21.421755+00:00') GROUP BY "table"."id", DATE_TRUNC('day', "table"."time") ORDER BY "table"."time" DESC;

這裏是其O/P（它包含更多的行數） - 它利用（ID，DATE_TRUNC開始組

id | time | status | group_id | period | count --------+---------------------------+----------------------+------------+---------------------------+------- 267821 | 2017-05-04 10:36:13+05:30 | 1 | 2177 | 2017-05-04 00:00:00+05:30 | 1 267790 | 2017-05-04 09:36:35+05:30 | 1 | 2177 | 2017-05-04 00:00:00+05:30 | 1 267786 | 2017-05-04 09:30:44+05:30 | 1 | 2177 | 2017-05-04 00:00:00+05:30 | 1 267735 | 2017-05-04 08:36:09+05:30 | 1 | 2177 | 2017-05-04 00:00:00+05:30 | 1 267696 | 2017-05-04 07:36:32+05:30 | 1 | 2177 | 2017-05-04 00:00:00+05:30 | 1 267650 | 2017-05-04 06:36:14+05:30 | 1 | 2177 | 2017-05-04 00:00:00+05:30 | 1 267603 | 2017-05-04 05:36:14+05:30 | 1 | 2177 | 2017-05-04 00:00:00+05:30 | 1 .... .... (149 rows)

默認IE（ 'day'，「table」，「time」））字段雖然我在y Django ORM Query中沒有提到。結果，輸出將會改變。

Django ORM默認情況下會考慮id字段嗎？有什麼辦法解決它？

來源

2017-05-05 tom

你爲什麼要添加兩個註釋？ –

我試圖實現也使用單註釋，但徒勞無功。 – tom

可以通過固定 -

SELECT 1 as id ,DATE_TRUNC('day', "table"."time") AS "period", COUNT("table"."status") AS "count" FROM "table" WHERE "table"."group_id" = '2177' and "table"."status"=1 and time >= '2017-04-28 12:48:33.348682+00:00' and time <= '2017-05-05 12:48:33.348682+00:00' GROUP BY DATE_TRUNC('day', "table"."time"),period ORDER BY period DESC limit {} offset {};

默認情況下，Django的需要返回ID（primary_key）字段。

來源

2017-05-18 09:24:24 tom

試試這個

TableModel.objects.filter(     
     group_id=group_id,           
     status=1,                  
     time__range = get_time_range(range)                  
    ).annotate(
      period=DateTrunc('day', 'time') # Truncate to day and add to select query 
    ).values('period') # Group By period 
    .annotate(count=Count('status')) # add count of the grouping to select 
    .values('period', 'count') 
    .order_by('-time')

來源

2017-05-05 12:39:59

得到相同的結果：| – tom

它正在打印相同的SQL？ –

這裏是 - ** SELECT DATE_TRUNC（'day'，「table」。「time」）AS「period」，COUNT（「table」。「status」）AS「count」FROM「table」WHERE（「table」。「time」BETWEEN'2017-04-28 12：48：33.348682 + 00：00'AND'2017-05-05 12：48：33.348682 + 00：00'AND「table」。「status」= 1 AND「表「」group_id「='2177'）GROUP BY DATE_TRUNC（'day'，」table「。」time「），」table「。」time「ORDER BY」table「。」time「DESC; ** – tom

Django Group按查詢？

回答

相關問題