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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.
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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. If you are using this attribute on a ForeignKey or ManyToManyField - you must always specify a unique reverse name for the field.






2. The first element in this iterable is the value that will be stored in the database - the second element will be displayed by the admin interface - or in a ModelChoiceField.






3. 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






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






5. 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.






6. 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






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






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






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






10. 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)






11. This gives your model metadata.






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






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






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






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






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






18. 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.






19. 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.






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






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






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






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






24. 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






25. 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






26. 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.






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






28. This method is more or less the opposite of defer(). You call it with the fields that should not be deferred when retrieving a model. If you have a model where almost all the fields need to be deferred - using this method to specify the complementary






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






30. 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






31. 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.






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






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






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






35. 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.






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






37. A Manager method that returns a new QuerySet containing objects that match the given lookup parameters.






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






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






40. 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






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






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. 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






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






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






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






48. Lookup type that yields a case-insensitive match.






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






50. Fields are specified by these