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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. (1) These cannot be Python reserved words - because that would result in a Python syntax error. (2) These cannot contain more than one underscore in a row - due to the way Django's query lookup syntax works.






2. Use this method to reverse the order in which a queryset's elements are returned. Calling this method a second time restores the ordering back to the normal direction.






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






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






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






6. 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.






7. These are specified as keyword arguments to the QuerySet methods filter() - exclude() and get(). These take the form field__lookuptype=value .






8. This query finds all entries between a start date of start_date and an end date of end_date.






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






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






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






12. 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






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






14. 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.






15. Lookup type that returns results with a case-insensitive end sequence.






16. This model method is used for updating a ManyToManyField.






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






18. 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.






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






20. Negation operator for Q objects.






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






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






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






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






25. Returns an EmptyQuerySet -- a QuerySet that always evaluates to an empty list. This can be used in cases where you know that you should return an empty result set and your caller is expecting a QuerySet object (instead of returning an empty list - fo






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






27. 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






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






29. 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






30. Returns the object matching the given lookup parameters






31. 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






32. 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.






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






34. 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.






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






36. A Python "magic method" that returns a unicode "representation" of any object.






37. 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.






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






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






40. 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.






41. 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.






42. These methods are intended to do "table-wide" things.






43. 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.






44. 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






45. This method is for controlling which database the QuerySet will be evaluated against if you are using more than one database. The only argument this method takes is the alias of a database - as defined in DATABASES.






46. 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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47. 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()






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






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