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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 gives your model metadata.






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






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






4. 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






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






6. 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.






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






8. 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






9. 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.






10. 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.






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






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






13. 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.






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






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






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






17. 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.






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

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19. 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.






20. 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






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






22. Conjuntion operator for Q objects.






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






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






25. 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






26. 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.






27. 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)






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






29. 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






30. 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.






31. 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.






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






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






34. 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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35. 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.






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






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






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






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






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






41. Lookup type that returns results greater than or equal to a given value.






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






43. 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.






44. 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.






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






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






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






48. a QuerySet can be sliced - using Python's array-slicing syntax.






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

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