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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. 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.






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






3. 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






4. If this option is True - Django will store empty values as NULL in the database. Default is False.






5. 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.






6. To activate your models






7. 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.






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






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






10. A manager method which returns a single object. If there are no results that match the query - this method will raise a DoesNotExist exception. If more than one item matches this query - the method will raise MultipleObjectsReturned.






11. When to run syncdb






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






13. 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.






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






15. Conjuntion operator for Q objects.






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






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






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






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






21. 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






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






23. 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.






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






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






26. 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






27. 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.






28. 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






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






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






31. 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






32. 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)






33. 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.






34. 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






35. Fields are specified by these






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






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






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






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






40. 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.






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






42. Lookup type that returns results greater than a given value.






43. 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






44. Keyword shortcut for looking up an object by primary key.






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






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






47. 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






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






49. 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.






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







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