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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. 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






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






3. 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






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






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






6. 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.






7. 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.






8. This gives your model metadata.






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






10. 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






11. 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






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






13. 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






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






15. 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.






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






17. Lookup type that corresponds to a boolean full-text search - taking advantage of full-text indexing. This is like contains but is significantly faster due to full-text indexing.






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






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






20. 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.






21. 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.






22. 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.






23. Defines a many-to-one relationship. ou use it just like any other Field type: by including it as a class attribute of your model.






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






25. To activate your models






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






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






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






29. 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






30. 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.






31. Disjunction operator for Q objects.






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






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






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






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






36. Conjuntion operator for Q objects.






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






38. 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.






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






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






41. Returns a DateQuerySet -- a QuerySet that evaluates to a list of datetime.datetime objects representing all available dates of a particular kind within the contents of the QuerySet.

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






43. Fields are specified by these






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






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






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






47. Returns the object matching the given lookup parameters






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






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

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50. 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.