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






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






3. The database that will be used if this query is executed now






4. This query deletes all Entry objects with a pub_date year of 2005.






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






6. Lookup type for date/datetime fields that finds an exact year match. Takes a four-digit year.






7. 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()






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






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






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






11. The first element in this iterable is the value that will be stored in the database - the second element will be displayed by the admin interface - or in a ModelChoiceField.






12. Lookup type that finds a case-sensitive regular expression match.






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






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






15. 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






16. 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






17. Takes a list of primary-key values and returns a dictionary mapping each primary-key value to an instance of the object with the given ID.






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






19. Lookup type that returns results with a case-sensitive end sequence.






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






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. 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.






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






24. 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.






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






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






27. 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






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






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






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






31. 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.

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


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






33. 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






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






35. A manager method which returns a single object. If there are no results that match the query - this method will raise a DoesNotExist exception. If more than one item matches this query - the method will raise MultipleObjectsReturned.






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






37. 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






38. what the field _______ determines: (1) The database column type (e.g. INTEGER - VARCHAR); (2) The widget to use in Django's admin interface - if you care to use it (e.g. <input type="text"> - <select>); (3) The minimal validation requirements - used






39. 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






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






41. This gives your model metadata.






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






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

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45. 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






46. 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.






47. 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






48. 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.






49. An iterable (e.g. - a list or tuple) of 2-tuples to use as options for this field. If this is given - Django's admin will use a select box instead of the standard text field and will limit options to those given.






50. Fields are specified by these