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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. 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






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






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






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






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






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






7. 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






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






9. Lookup type for date/datetime fields that finds a 'day of the week' match.






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






11. 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.






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






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






14. 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






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






16. 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.






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. 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.






19. Performs an SQL delete query on all rows in the QuerySet. This method is applied instantly. You cannot call this method on a QuerySet that has had a slice taken or can otherwise no longer be filtered.






20. 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






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






22. This method returns tuples of values when iterated over. Each tuple contains the value from the respective field passed into the call to this method -- so the first item is the first field - etc.






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






24. 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






25. Takes a list of primary-key values and returns a dictionary mapping each primary-key value to an instance of the object with the given ID.






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






27. 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


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






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






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






31. Returns the object matching the given lookup parameters






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






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 method immediately deletes the object and has no return value.






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






36. Evaluates the QuerySet (by performing the query) and returns an iterator over the results. A QuerySet typically caches its results internally so that repeated evaluations do not result in additional queries; this method will instead read results dire






37. 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.






38. 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






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






40. An iterable (e.g. - a list or tuple) of 2-tuples to use as options for this field. If this is given - Django's admin will use a select box instead of the standard text field and will limit options to those given.






41. 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.






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






43. To activate your models






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






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






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






47. 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.






48. Lookup type that returns results in a given list.






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






50. 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



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