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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. 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.






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






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






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






5. 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






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






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






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






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






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






12. 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






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






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






15. 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






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






17. Evaluation happens upon use the "step" parameter of slice syntax - the first time you iterate over it - when pickling or caching results - upon calling repr() - upon calling len() - upon calling list() - upon calling bool()






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






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






20. 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.






21. 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






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






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






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






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






26. Lookup type that returns results less than a given value.






27. A manager method that returns a new QuerySet containing objects that do not match the given lookup parameters.






28. 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






29. 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.






30. The default for this is the name of the child class followed by '_set'.






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






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






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






34. Negation operator for Q objects.






35. 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.






36. (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.






37. 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.






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






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






40. 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.






41. To activate your models






42. Conjuntion operator for Q objects.






43. When to run syncdb






44. 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.






45. 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.






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






47. 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






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






49. 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.






50. A Q object that asks for entries with a question value that start with 'Who' or do not have a publication date of 2005.

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