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






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






3. 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






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






5. When to run syncdb






6. 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()






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






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






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






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






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






13. Fields are specified by these






14. 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)






15. 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.






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






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






18. 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.






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






20. Disjunction operator for Q objects.






21. 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.






22. 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.






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






24. 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.






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






26. 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.






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






28. 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






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






30. 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.






31. 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






32. 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.






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






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






35. 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.






36. 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.






37. 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.






38. 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.






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






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






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






43. 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.






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






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






46. 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.






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






48. The first element in this iterable is the value that will be stored in the database - the second element will be displayed by the admin interface - or in a ModelChoiceField.






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






50. 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