Test your basic knowledge |

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






2. 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.






3. Fields are specified by these






4. 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.






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






6. 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.






7. Manager method used to retrieve every object in a model.






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






9. 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


10. 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.






11. 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


12. To activate your models






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






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






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






16. Operator for comparing two model instances for equality. Behind the scenes - it compares the primary key values of two models.






17. 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.






18. 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


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






20. 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






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

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


22. 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.






23. 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






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






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






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






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






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






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






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






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






32. Returns the object matching the given lookup parameters






33. 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)






34. 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






35. 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






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






37. 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.






38. Negation operator for Q objects.






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






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






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






42. 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






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






44. 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.






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






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






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






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






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






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