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This article mainly introduces "will order_by in django affect the query results of the combination of values_list and distinct". In the daily operation, I believe that many people have doubts about whether order_by in django will affect the query results of the combination of values_list and distinct. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the question "will order_by in django affect the query results of the combination of values_list and distinct?" Next, please follow the editor to study!

There is such a query in the project

TaskDetail.objects.values_list ('deploy_app_groups', flat=True) .distinct ()

Duplicates were found in the returned results

Looking at the sql statement in LOG, you can see that several fields in the table are queried, and then distinct these fields together, which is certainly not unique. I don't know why I didn't just check the fields I need.

Refer to this post:

Https://stackoverflow.com/questions/10848809/django-model-get-distinct-value-list

Add a drder_by, and it will be fine.

TaskDetail.objects.order_by ('deploy_app_groups'). Values_list (' deploy_app_groups', flat=True). Distinct ()

Check the sql that is executed, and only check the fields that need to be queried.

At this point, the study on "will order_by in django affect the query results of the combination of values_list and distinct" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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