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Django Queryset

Subject : it-skills
Instructions:
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Used to get a QuerySet for a model. This is called 'objects' by default.






2. Returns a copy of the current QuerySet (or QuerySet subclass you pass in). This can be useful in some situations where you might want to pass in either a model manager or a QuerySet and do further filtering on the result. You can safely call all() on






3. Specifies the model that will be used to govern the many-to-many relationship. You can then put extra fields on the intermediate model. The intermediate model is associated with the ManyToManyField using this to point to the model that will act as an






4. Lookup type that returns results less than or equal to a given value.






5. This method immediately deletes the object and has no return value.






6. This gives your model metadata.






7. This class type is useful when you just want to use the parent class to hold information that you don't want to have to type out for each child model. This class isn't going to ever be used in isolation. When it is used as a base class for other mode






8. This model type is useful if you only want to modify the Python-level behavior of a model - without changing the models fields in any way. This creates a stand-in for the original model. You can create - delete and update instances of this new model






9. Returns a new QuerySet that uses SELECT DISTINCT in its SQL query. This eliminates duplicate rows from the query results.






10. Each one of these is a Python class that subclasses django.db.models.Model. Each attribute of one of these represents a database field.






11. A manager method that returns a new QuerySet containing objects that do not match the given lookup parameters.






12. Defines a one-to-one relationship. You use it just like any other Field type: by including it as a class attribute of your model.






13. This style of inheritanc is useful when you're subclassing an existing model (perhaps something from another application entirely) and want each model to have its own database table. Here - each model in the hierarchy is a model all by itself.






14. Lookup type that returns results greater than a given value.






15. This object allows you to compare the value of a model field with another field on the same model. Django supports the use of addition - subtraction - multiplication - division and modulo arithmetic with these objects - both with constants and with o






16. Adds to each object in the QuerySet with the provided list of aggregate values (averages - sums - etc) that have been computed over the objects that are related to the objects in the QuerySet. Each argument to this is content that will be added to ea






17. If you are using this attribute on a ForeignKey or ManyToManyField - you must always specify a unique reverse name for the field.






18. Lookup type that tests for inclusion in a case-sensitive fashion.






19. Exception raised by get(**kwargs) if no items match the query.






20. Defines a many-to-one relationship. ou use it just like any other Field type: by including it as a class attribute of your model.






21. Performs an SQL delete query on all rows in the QuerySet. This method is applied instantly. You cannot call this method on a QuerySet that has had a slice taken or can otherwise no longer be filtered.






22. Defined by django.db.models.ForeignKey. You use it just like any other Field type: by including it as a class attribute of your model.






23. If True - this field is the primary key for the model.






24. Accomplish this by using the field name of related fields across models - separated by double underscores - until you get to the field you want. For example - to get all Entry objects with a Blog whose name is 'Beatles Blog': Entry.objects.filter(blo






25. A convenience method for constructing an object and saving it all in one step.






26. A Manager method that returns a new QuerySet containing objects that match the given lookup parameters.






27. True if the QuerySet has an order_by() clause or a default ordering on the model. False otherwise.






28. This field is added automatically - but this behavior can be overridden






29. This object encapsulates a collection of keyword arguments - with the keys being field lookup types. These objects can be combined using the & and | operators - as well as negated with the ~ operator.






30. Defined by a ManyToManyField. You use it just like any other Field type: by including it as a class attribute of your model.






31. Returns a ValuesQuerySet -- a QuerySet that returns dictionaries when used as an iterable - rather than model-instance objects.






32. Lookup type that yields a case-insensitive match.






33. Manager method used to retrieve every object in a model.






34. Lookup type for date/datetime fields that finds a 'day of the week' match.






35. Lookup type that returns results less than a given value.






36. Evaluation happens upon use the "step" parameter of slice syntax - the first time you iterate over it - when pickling or caching results - upon calling repr() - upon calling len() - upon calling list() - upon calling bool()






37. This is a criterion that narrow down a QuerySet based on given parameters.






38. a QuerySet can be sliced - using Python's array-slicing syntax.






39. Returns a DateQuerySet -- a QuerySet that evaluates to a list of datetime.datetime objects representing all available dates of a particular kind within the contents of the QuerySet.

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40. The default for this is the name of the child class followed by '_set'.






41. Returns an integer representing the number of objects in the database matching the QuerySet. This never raises exceptions.






42. This query finds all entries with an id in the list [1 - 3 - 4]






43. This query finds all entries with an id greater than 4.






44. Returns a QuerySet that will automatically "follow" foreign-key relationships - selecting that additional related-object data when it executes its query. This is a performance booster which results in (sometimes much) larger queries but means later u






45. These add custom "row-level" functionality to your objects. These act on a particular model instance.






46. This model method saves a model instance to the database. This method has no return value.






47. Returns True if the QuerySet contains any results - and False if not. This tries to perform the query in the simplest and fastest way possible - but it does execute nearly the same query. This means that calling this method on a queryset is faster th






48. Disjunction operator for Q objects.






49. Lookup type that returns results that fall into an inclusive date range.






50. Returns the most recent object in the table - by date - using the field_name provided as the date field.