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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. 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






2. 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.






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






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






5. 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.






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






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






8. 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.






9. Returns the object matching the given lookup parameters






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






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






12. 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.






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






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






16. 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






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






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






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






20. 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






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






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






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






24. 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.






25. When to run syncdb






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






27. (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.






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






29. Fields are specified by these






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






31. 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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32. 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.






33. To activate your models






34. Lookup type for date/datetime fields that finds an exact day match.






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






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






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






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






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






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






42. 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.






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






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






45. 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






46. 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






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






48. 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






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






50. 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.