I\'m doing this query: SomeObject.objects.annotate(something=Avg(\'something\')).order_by(something).all()
VB.NET .NET 3.5 I have an aggregate class called Package as part of a shipp开发者_JAVA百科ing system.Package contains another class, BoxType .BoxType contains information about the box used to ship t
If I run a query such as: SELECT COUNT(*) as num FRO开发者_运维技巧M table WHERE x = \'y\' Will it always return a result, even when the query doesn\'t match any record? Or do I need to validate an
Most common ORMs implement persistence by reachability, either as the default object 开发者_StackOverflow社区graph change tracking mechanism or an optional.
I have read about the Aggregate Pattern but I\'m confused about something here. The pattern states that all the objects belonging to the aggregate should be accessed via the Aggregate Root, and not di
So I have some data that looks like this. `USERID1 USERID2` 110 开发者_如何学Python220 230 340 350 110
I am design and EMR. I have determined the central object to the domain is the Patient.The patient must have the following a Doctor and Medical Records.Medical Records is a grouping term refering to t
I have a Linq collection of Things, where Thing has an Amount (decimal) property. I开发者_如何学JAVA\'m trying to do an aggregate on this for a certain subset of Things:
What I would like ask is best illustrated by an example, so bear with me. Suppose I have the following table:
I have a report model looking a bit开发者_如何学Python like this: class Report(models.Model): date = models.DateField()