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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. 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.






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






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






4. 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.






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






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






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






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






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






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






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






12. 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.






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






14. 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.






15. 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.






16. 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.






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






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






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






21. 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






22. 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.






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






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






25. Returns the object matching the given lookup parameters






26. 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.






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






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






29. This query updates all the headlines with pub_date in 2007 to read 'Everything is the same'.

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30. 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.






31. 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.






32. 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.






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






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






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






36. 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






37. Fields are specified by these






38. 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






39. 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.






40. 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.






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






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






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






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






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






46. 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.






47. 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.






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






49. 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.






50. 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.







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