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Django Queryset

Subject : it-skills
Instructions:
  • Answer 50 questions in 15 minutes.
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  • 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 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.






2. 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






3. 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






4. 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.






5. 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






6. 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






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






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






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






10. 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.






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






12. 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.






13. Returns an integer representing the number of objects in the database matching the QuerySet. This never raises exceptions.






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






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






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






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






18. Returns the object matching the given lookup parameters






19. 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.






20. 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.






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






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






23. To activate your models






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






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






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






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






28. Fields are specified by these






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






30. Extra text to be displayed under the field on the object's admin form to provide assistance to users. It's useful for documentation even if your object doesn't have an admin form.






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






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






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






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






35. 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






36. 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


37. 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






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






39. 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.






40. 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






41. 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)






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






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






44. 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






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






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






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






48. 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.






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






50. Evaluation happens upon use the "step" parameter of slice syntax - the first time you iterate over it - when pickling or caching results - upon calling repr() - upon calling len() - upon calling list() - upon calling bool()