Query Set Annotate with two different query sets












0















I'm new to joining two query sets with django orm manipulations. Here is my request. I have two data sets. 1st data set has three columns which are datetime, col1 and 2nd data set has start_date,end_date,week_num. Output data should be weeknum, col1. How can I use django to combine these two models?



First data set:



datetime              col1

2018-10-04 08:00:00   10


Second data set:



start_date            end_date               week_num

2018-10-04 07:00:00   2018-10-11 07:00:00    42


Output data set:



weeknum              col1

42                    10


My code so far: 



qs1=models.dataset1.objects.all()

qs2=models.dataset2.objects.all()


I know I'm just putting in the basic datasets, but I'm unable to move any further.



SQL Query for this would be like: 



 select weeknum, col1 from datatset1 d1, dataset2 d2 where 

 d1.datettime>d2.start_date and d1.datetime<d2.end_date;


Any help on this is greatly appreciated. Thanks.






django django-rest-framework django-queryset







share|improve this question



























    0















    I'm new to joining two query sets with django orm manipulations. Here is my request. I have two data sets. 1st data set has three columns which are datetime, col1 and 2nd data set has start_date,end_date,week_num. Output data should be weeknum, col1. How can I use django to combine these two models?



    First data set:



    datetime              col1
    
2018-10-04 08:00:00   10


    Second data set:



    start_date            end_date               week_num
    
2018-10-04 07:00:00   2018-10-11 07:00:00    42


    Output data set:



    weeknum              col1
    
42                    10


    My code so far: 



    qs1=models.dataset1.objects.all()
    
qs2=models.dataset2.objects.all()


    I know I'm just putting in the basic datasets, but I'm unable to move any further.



    SQL Query for this would be like: 



     select weeknum, col1 from datatset1 d1, dataset2 d2 where 
    
 d1.datettime>d2.start_date and d1.datetime<d2.end_date;


    Any help on this is greatly appreciated. Thanks.






    django django-rest-framework django-queryset







    share|improve this question

























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      0








      I'm new to joining two query sets with django orm manipulations. Here is my request. I have two data sets. 1st data set has three columns which are datetime, col1 and 2nd data set has start_date,end_date,week_num. Output data should be weeknum, col1. How can I use django to combine these two models?



      First data set:



      datetime              col1
      
2018-10-04 08:00:00   10


      Second data set:



      start_date            end_date               week_num
      
2018-10-04 07:00:00   2018-10-11 07:00:00    42


      Output data set:



      weeknum              col1
      
42                    10


      My code so far: 



      qs1=models.dataset1.objects.all()
      
qs2=models.dataset2.objects.all()


      I know I'm just putting in the basic datasets, but I'm unable to move any further.



      SQL Query for this would be like: 



       select weeknum, col1 from datatset1 d1, dataset2 d2 where 
      
 d1.datettime>d2.start_date and d1.datetime<d2.end_date;


      Any help on this is greatly appreciated. Thanks.






      django django-rest-framework django-queryset







      share|improve this question














      I'm new to joining two query sets with django orm manipulations. Here is my request. I have two data sets. 1st data set has three columns which are datetime, col1 and 2nd data set has start_date,end_date,week_num. Output data should be weeknum, col1. How can I use django to combine these two models?



      First data set:



      datetime              col1
      
2018-10-04 08:00:00   10


      Second data set:



      start_date            end_date               week_num
      
2018-10-04 07:00:00   2018-10-11 07:00:00    42


      Output data set:



      weeknum              col1
      
42                    10


      My code so far: 



      qs1=models.dataset1.objects.all()
      
qs2=models.dataset2.objects.all()


      I know I'm just putting in the basic datasets, but I'm unable to move any further.



      SQL Query for this would be like: 



       select weeknum, col1 from datatset1 d1, dataset2 d2 where 
      
 d1.datettime>d2.start_date and d1.datetime<d2.end_date;


      Any help on this is greatly appreciated. Thanks.






      django django-rest-framework django-queryset




      django django-rest-framework django-queryset






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      asked Nov 19 '18 at 19:10









      ReddyReddy

      63




      63
























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          You won't be able to use querysets to combine since they're designed to be model-specific (w/the exception of proxy and abstract models).



          You can however use a list comprehension to combine them or use itertools.chain (more efficient) to combine the two results from the querysets.



          However, you'll lose out on the "laziness" of the queryset, which may have performance ramifications later.






          share|improve this answer























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            1 Answer
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            active

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            active

            oldest

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            active

            oldest

            votes









            0














            You won't be able to use querysets to combine since they're designed to be model-specific (w/the exception of proxy and abstract models).



            You can however use a list comprehension to combine them or use itertools.chain (more efficient) to combine the two results from the querysets.



            However, you'll lose out on the "laziness" of the queryset, which may have performance ramifications later.






            share|improve this answer




























              0














              You won't be able to use querysets to combine since they're designed to be model-specific (w/the exception of proxy and abstract models).



              You can however use a list comprehension to combine them or use itertools.chain (more efficient) to combine the two results from the querysets.



              However, you'll lose out on the "laziness" of the queryset, which may have performance ramifications later.






              share|improve this answer


























                0












                0








                0







                You won't be able to use querysets to combine since they're designed to be model-specific (w/the exception of proxy and abstract models).



                You can however use a list comprehension to combine them or use itertools.chain (more efficient) to combine the two results from the querysets.



                However, you'll lose out on the "laziness" of the queryset, which may have performance ramifications later.






                share|improve this answer













                You won't be able to use querysets to combine since they're designed to be model-specific (w/the exception of proxy and abstract models).



                You can however use a list comprehension to combine them or use itertools.chain (more efficient) to combine the two results from the querysets.



                However, you'll lose out on the "laziness" of the queryset, which may have performance ramifications later.







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Nov 20 '18 at 3:09









                yrekkehsyrekkehs

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