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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. This object allows you to compare the value of a model field with another field on the same model. Django supports the use of addition - subtraction - multiplication - division and modulo arithmetic with these objects - both with constants and with o






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






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






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






5. 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






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






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






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






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






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






11. 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






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






13. 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






14. Use this method to reverse the order in which a queryset's elements are returned. Calling this method a second time restores the ordering back to the normal direction.






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






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






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






19. 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.






20. Returns the most recent object in the table - by date - using the field_name provided as the date field.






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






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






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






24. 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






25. This represents a collection of objects from your database. It can have zero - one or many filters.






26. 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.






27. This object encapsulates a collection of keyword arguments - with the keys being field lookup types. These objects can be combined using the & and | operators - as well as negated with the ~ operator.






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






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






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






31. (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.






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






33. This query deletes all Entry objects with a pub_date year of 2005.






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






35. 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.






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






37. 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.






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






39. 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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40. 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.






41. 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.






42. 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.






43. Disjunction operator for Q objects.






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






45. 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.






46. Conjuntion operator for Q objects.






47. 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






48. 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






49. Here - you can't use add - create - or assignment (i.e. - beatles.members = [...]) to create relationships. You need to specify all the detail for the relationship required by the intermediate model.






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







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