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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. When to run syncdb






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






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






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






5. 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






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






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






8. 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






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






10. 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.






11. A Q object that encapsulates queries for entries with a question value that starts with 'What' in a case-insensitive fashion.

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






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

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14. Fields are specified by these






15. 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.






16. 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.






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






18. 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






19. 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.






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






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






22. Negation operator for Q objects.






23. Disjunction operator for Q objects.






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






25. Lookup type that returns results with a case-sensitive end sequence.






26. 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






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






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






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






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






31. 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.






32. Lookup type that returns results less than or equal to a given value.






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






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






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






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






37. Adds to each object in the QuerySet with the provided list of aggregate values (averages - sums - etc) that have been computed over the objects that are related to the objects in the QuerySet. Each argument to this is content that will be added to ea






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






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






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






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






42. 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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43. 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






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






45. The value given in the absence of a specified value for the field. This can be a value or a callable object. If callable it will be called every time a new object is created.






46. 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.






47. 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






48. 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.






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






50. 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