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






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






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. 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)






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






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






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






9. 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






10. 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.






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






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






13. This tells Django how to calculate the URL for an object. Django uses this in its admin interface - and any time it needs to figure out a URL for an object.






14. 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.






15. Returns the object matching the given lookup parameters






16. 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.






17. 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.






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

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19. When to run syncdb






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






21. Conjuntion operator for Q objects.






22. 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






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






24. 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






25. 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.






26. 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.






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






28. This style of inheritanc is useful when you're subclassing an existing model (perhaps something from another application entirely) and want each model to have its own database table. Here - each model in the hierarchy is a model all by itself.






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






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






31. 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






32. 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






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






34. 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






35. 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.






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






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






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






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






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






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






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






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






44. 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.






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

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46. Accomplish this by using the field name of related fields across models - separated by double underscores - until you get to the field you want. For example - to get all Entry objects with a Blog whose name is 'Beatles Blog': Entry.objects.filter(blo






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






48. Negation operator for Q objects.






49. To activate your models






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