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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. 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.






2. 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.






3. 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.






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






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






6. Keyword shortcut for looking up an object by primary key.






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






8. (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.






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






10. Fields are specified by these






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






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






13. Lookup type that finds a case-insensitive regular expression match.






14. 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.






15. 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.






16. 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.






17. 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.






18. To activate your models






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






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






21. 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.






22. This query updates all the headlines with pub_date in 2007 to read 'Everything is the same'.

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


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






24. 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






25. 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.






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






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

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


28. 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.






29. 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.






30. 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.






31. 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.






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

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


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






34. 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)






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






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






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






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






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






40. A QuerySet is iterable - and it executes its database query the first time you iterate over it.






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






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






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






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






45. 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






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






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






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






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






50. Performs an SQL update query for the specified fields - and returns the number of rows affected. This method is applied instantly and the only restriction on the QuerySet that is updated is that it can only update columns in the model's main table. F