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






2. Exception raised by get(**kwargs) if more than one item matches the query.






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






4. 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






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






6. 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.






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






8. Negation operator for Q objects.






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






10. 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.






11. 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






12. Lookup type that returns results with a case-sensitive start sequence.






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






14. 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.






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






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






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






18. 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






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






20. Conjuntion operator for Q objects.






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






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






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






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






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






26. 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






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






28. 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.






29. 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






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






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






32. 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


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






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






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






36. 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.






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






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






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






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






41. (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.






42. 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






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






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






46. 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)






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






48. 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






49. Returns True if the QuerySet contains any results - and False if not. This tries to perform the query in the simplest and fastest way possible - but it does execute nearly the same query. This means that calling this method on a queryset is faster th






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