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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. Specifies the model that will be used to govern the many-to-many relationship. You can then put extra fields on the intermediate model. The intermediate model is associated with the ManyToManyField using this to point to the model that will act as an






2. This gives your model metadata.






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






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






5. Disjunction operator for Q objects.






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






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






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






9. This object encapsulates a collection of keyword arguments - with the keys being field lookup types. These objects can be combined using the & and | operators - as well as negated with the ~ operator.






10. 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






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






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






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






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






15. 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.






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






17. 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






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






19. Exception raised by get(**kwargs) if no items match the query.






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






21. 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.






22. 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






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






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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


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






26. 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.






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






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






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






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






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






32. 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.






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






34. A Q object that asks for entries with a question value that start with 'Who' or do not have a publication date of 2005.

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


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






36. 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






37. 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






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






39. (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.






40. 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






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. 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.






43. Here - you can't use add - create - or assignment (i.e. - beatles.members = [...]) to create relationships. You need to specify all the detail for the relationship required by the intermediate model.






44. 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.






45. Fields are specified by these






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






47. Returns the object matching the given lookup parameters






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






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






50. To activate your models