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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. 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






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






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






4. 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.






5. 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






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

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


7. 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.






8. 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.






9. Negation operator for Q objects.






10. 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.






11. To activate your models






12. 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.






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






14. (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.






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






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






17. 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.






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






19. When to run syncdb






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






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






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. 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.






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






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






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






27. 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.






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






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






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






31. Disjunction operator for Q objects.






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






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






34. 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






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






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






38. 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.






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






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






41. 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






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






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






44. Fields are specified by these






45. 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()






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






47. 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)






48. 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


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






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






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