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






2. Can be used to remove all many-to-many relationships for an instance






3. 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






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






5. 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.






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






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






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






9. 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






10. 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.






11. 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)






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






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






15. When to run syncdb






16. 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.






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






18. 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






19. 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.






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






21. Returns the object matching the given lookup parameters






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






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






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






25. 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.






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






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






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






29. This field is added automatically - but this behavior can be overridden






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






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






32. 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






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






34. 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.






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






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






37. 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.






38. 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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39. 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.






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






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






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






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






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






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






47. 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.






48. 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.






49. 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






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

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