Django. Complex annotations require an alias. What is alias here?

问题:

I'm trying to get the maximun & minimum value of a model with this query:

max_min_price = MyModel.objects.annotate(Min('price', Max('price'))) 

But I get the error:

Complex annotations require an alias

I'm not sure what an alias means here and the docs are not clear in my opinion. Any advice will help.

回答1:

You need to give a name to the result of Min, since Django wouldn't be able to derive the name for complex aggregate functions:

max_min_price = MyModel.objects.annotate(min_price=Min('price', Max('price'))) 

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