Django filter find the smallest number group by other column

Question

I have a database structure like as below:

id     listing     sequence    result

1       1          0           hfdn
2       1          1           hkoq
3       1          2           qaz
4       2          1           bnm
5       3          1           h456
6       3          2           vnm
7       4          0           45hv
8       4          1           1lc0

I want to get each group of listing whose sequence is the smallest, the example result is as below:

{listing:1, sequence:0}, {listing:2, sequence:1}, {listing:3, sequence:1}, {listing:4, sequence:0}

and their matching result.

PS: some sequence is start from 0, some is start from 1, or even more.

Answer 1

you need to group_by listing and get minimum sequence value. If your model name is MyModel , then this should work fine:

MyModel.objects.values('listing').annotate(min_sequence=Min('sequence'))