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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. 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)






2. 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






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






4. 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






5. 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.






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






7. This method returns tuples of values when iterated over. Each tuple contains the value from the respective field passed into the call to this method -- so the first item is the first field - etc.






8. 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.






9. 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.






10. 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()






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






12. 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






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






14. 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.






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






17. 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






18. 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






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






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






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






22. Lookup type that corresponds to a boolean full-text search - taking advantage of full-text indexing. This is like contains but is significantly faster due to full-text indexing.






23. In some complex data-modeling situations - your models might contain a lot of fields - some of which could contain a lot of data (for example - text fields) - or require expensive processing to convert them to Python objects. If you are using the res






24. If True - the table does not permit duplicate values for this field.






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






26. 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






27. 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






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






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






30. 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.






31. Conjuntion operator for Q objects.






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






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






34. 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.






35. To activate your models






36. 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.






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






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






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






40. Returns a new QuerySet containing objects that match the given lookup parameters.






41. Negation operator for Q objects.






42. 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.






43. 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






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






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






46. The value given in the absence of a specified value for the field. This can be a value or a callable object. If callable it will be called every time a new object is created.






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






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






49. 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.






50. Disjunction operator for Q objects.