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Django Queryset

Subject : it-skills
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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. This method is more or less the opposite of defer(). You call it with the fields that should not be deferred when retrieving a model. If you have a model where almost all the fields need to be deferred - using this method to specify the complementary






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






3. Sometimes - the Django query syntax by itself can't easily express a complex WHERE clause. For these edge cases - Django provides this QuerySet modifier -- a hook for injecting specific clauses into the SQL generated by a QuerySet.






4. Used to get a QuerySet for a model. This is called 'objects' by default.






5. restrictions on ________: (1) Your intermediate model must contain one - and only one - foreign key to the target model. (2) Your intermediate model must contain one - and only one - foreign key to the source model. (3) When defining a many-to-many r






6. 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.






7. Lookup type that returns results with a case-insensitive start sequence.






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






9. In this case - an intermediate model can have multiple foreign keys to the source model. Here - two foreign keys to the same model are permitted - but they will be treated as the two (different) sides of the many-to-many relation.






10. Takes the ouput of one filter and uses it as input for another filter. This works because a refinement of a QuerySet is itself a QuerySet.






11. Lookup type that returns results with a case-sensitive start sequence.






12. A Q object that encapsulates queries for entries with a question value that starts with 'What' in a case-insensitive fashion.

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13. Lookup type for date/datetime fields that finds an exact day match.






14. By default - results returned by a QuerySet are ordered by the ordering tuple given by the ordering option in the model's Meta. You can override this on a per-QuerySet basis by using the this method.






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






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






17. This query uses an F object to increment the pingback count for every entry in the blog.

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18. 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.






19. Lookup type that takes either True or False and corresponds to SQL queries of IS NULL and IS NOT NULL - respectively.






20. A convenience method for looking up an object with the given kwargs - creating one if necessary.






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






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






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






24. If this option is True - the field is allowed to be blank. Default is False.






25. Lookup type that yields an "exact" match. If you don't provide a lookup type -- that is - if your keyword argument doesn't contain a double underscore -- the lookup type is assumed to be of this sort.






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






27. If you pickle a QuerySet - this will force all the results to be loaded into memory prior to pickling. When you unpickle a QuerySet - it contains the results at the moment it was pickled - rather than the results that are currently in the database.






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






29. Exception raised by get(**kwargs) if more than one item matches the query.






30. 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






31. Returns a dictionary of aggregate values (averages - sums - etc) calculated over the QuerySet. Each argument to this method specifies a value that will be included in the dictionary that is returned.






32. Can be used to remove all many-to-many relationships for an instance






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






34. Lookup type for date/datetime fields that finds an exact month match. Takes an integer 1 (January) through 12






35. This tells Django how to calculate the URL for an object. Django uses this in its admin interface - and any time it needs to figure out a URL for an object.






36. Here - you can't use add - create - or assignment (i.e. - beatles.members = [...]) to create relationships. You need to specify all the detail for the relationship required by the intermediate model.






37. When to run syncdb






38. These are "anything that's not a field" - such as ordering options (ordering) - database table name (db_table) - or human-readable singular and plural names (verbose_name and verbose_name_plural)






39. Lookup type that returns results in a given list.






40. This represents a collection of objects from your database. It can have zero - one or many filters.






41. Fields are specified by these






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






43. A Q object that asks for entries with a question value that start with 'Who' or do not have a publication date of 2005.

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44. If this option is True - Django will store empty values as NULL in the database. Default is False.






45. Evaluates the QuerySet (by performing the query) and returns an iterator over the results. A QuerySet typically caches its results internally so that repeated evaluations do not result in additional queries; this method will instead read results dire






46. 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






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






48. To activate your models






49. This gives your model metadata.






50. This sets a field to a particular value for all the objects in a QuerySet. You can only set non-relation fields and ForeignKey fields using this method.