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Test your basic knowledge |
Django Queryset
Start Test
Study First
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. 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.
intermediate models
MultipleObjectsReturned
iexact
aggregate(args - *kwargs)
2. Lookup type that returns results with a case-sensitive end sequence.
delete()
OneToOneField
endswith
default
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
annotate(args - *kwargs)
count()
Entry.objects.filter(pub_date__range=(start_date - end_date))
intermediate models
4. If this option is True - Django will store empty values as NULL in the database. Default is False.
null
get(**kwargs)
iexact
Q()
5. 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.
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
many-to-one relationship
update()
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
6. To activate your models
in_bulk(id_list)
range
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
filter
7. 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.
regex
Entry.objects.all().update(n_pingbacks=F('n_pingbacks') + 1)
create(**kwargs)
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
8. This field is added automatically - but this behavior can be overridden
Field lookups
id field
delete()
Entry.objects.filter(id__gt=4)
9. Returns an integer representing the number of objects in the database matching the QuerySet. This never raises exceptions.
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
~
count()
exact
10. 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.
model
Abstract base class
get(**kwargs)
ordered
11. When to run syncdb
only(*fields)
filter chaining
when you add new apps to INSTALLED_APPS
null
12. True if the QuerySet has an order_by() clause or a default ordering on the model. False otherwise.
ManyToManyField
ordered
Entry.objects.filter(pub_date__year=2007).update(headline='Everything is the same')
startswith
13. 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.
contains
all()
OneToOneField
Multi-table inheritance
14. Lookup type for date/datetime fields that finds an exact year match. Takes a four-digit year.
Meta class
count()
year
get(**kwargs)
15. Conjuntion operator for Q objects.
Manager
F()
&
many-to-many relationship
16. Lookup type that yields a case-insensitive match.
&
Entry.objects.filter(pub_date__range=(start_date - end_date))
iexact
exists()
17. This method immediately deletes the object and has no return value.
unique
Abstract base class
Entry.objects.filter(pub_date__range=(start_date - end_date))
delete()
18. Lookup type that returns results less than or equal to a given value.
range
in_bulk(id_list)
iregex
lte
19. A Q object that encapsulates queries for entries with a question value that starts with 'What' in a case-insensitive fashion.
Warning
: Invalid argument supplied for foreach() in
/var/www/html/basicversity.com/show_quiz.php
on line
183
20. Lookup type that returns results that fall into an inclusive date range.
range
class attributes
related_name
dates(field - kind - order='ASC')
21. 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
get(**kwargs)
get_or_create(**kwargs)
Proxy model
all()
22. Returns the most recent object in the table - by date - using the field_name provided as the date field.
latest(field_name=None)
Multi-table inheritance
all()
Entry.objects.filter(pub_date__year=2005).delete()
23. 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.
db
Many-to-many relationship to self
class type
delete()
24. This model method saves a model instance to the database. This method has no return value.
all()
iterator()
save()
Field lookups
25. Lookup type that tests for inclusion in a case-sensitive fashion.
==
order_by(*fields)
update(**kwargs)
contains
26. 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
update()
class type
one-to-one relationship
get_absolute_url()
27. 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.
Entry.objects.filter(id__gt=4)
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
default
update(**kwargs)
28. Returns a QuerySet that will automatically "follow" foreign-key relationships - selecting that additional related-object data when it executes its query. This is a performance booster which results in (sometimes much) larger queries but means later u
save()
class attributes
all()
select_related()
29. Defined by a ManyToManyField. You use it just like any other Field type: by including it as a class attribute of your model.
get_or_create(**kwargs)
many-to-many relationship
Entry.objects.filter(id__in=[1 - 3 - 4])
Q(question__istartswith='What')
30. Lookup type that finds a case-sensitive regular expression match.
class attributes
intermediate models
regex
choices
31. 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
lte
relationship spanning
reverse()
__unicode__()
32. 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)
Model metadata
istartswith
gt
get(**kwargs)
33. Extra text to be displayed under the field on the object's admin form to provide assistance to users. It's useful for documentation even if your object doesn't have an admin form.
choices tuple
day
help_text
intermediate models
34. This class type is useful when you just want to use the parent class to hold information that you don't want to have to type out for each child model. This class isn't going to ever be used in isolation. When it is used as a base class for other mode
&
id field
intermediate models
Abstract base class
35. Fields are specified by these
choices tuple
OneToOneField
istartswith
class attributes
36. Returns a ValuesQuerySet -- a QuerySet that returns dictionaries when used as an iterable - rather than model-instance objects.
distinct()
values(*fields)
through argument
blank
37. This query finds all entries between a start date of start_date and an end date of end_date.
get(**kwargs)
Q(question__istartswith='What')
clear() method
Entry.objects.filter(pub_date__range=(start_date - end_date))
38. Operator for comparing two model instances for equality. Behind the scenes - it compares the primary key values of two models.
==
class type
Q()
reverse name
39. This query finds all entries with an id greater than 4.
iexact
OneToOneField
regex
Entry.objects.filter(id__gt=4)
40. 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.
OneToOneField
gt
dates(field - kind - order='ASC')
Proxy model
41. Returns a new QuerySet containing objects that match the given lookup parameters.
Field lookups
Many-to-many relationship to self
filter(**kwargs)
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
42. Lookup type that returns results greater than a given value.
annotate(args - *kwargs)
__unicode__()
gt
choices
43. 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
QuerySet
iregex
get_or_create(**kwargs)
through argument
44. Keyword shortcut for looking up an object by primary key.
iterator()
pk
using(alias)
in
45. This represents a collection of objects from your database. It can have zero - one or many filters.
Manager
==
aggregate(args - *kwargs)
QuerySet
46. A Python "magic method" that returns a unicode "representation" of any object.
Manager
istartswith
__unicode__()
values_list(*fields)
47. 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
Restrictions on field names
F()
Field lookups
QuerySet
48. A QuerySet is iterable - and it executes its database query the first time you iterate over it.
istartswith
iteration
lt
ForeignKey
49. 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.
update()
select_related()
all()
filter(**kwargs)
50. Each one of these is a Python class that subclasses django.db.models.Model. Each attribute of one of these represents a database field.
model
all()
isnull
in_bulk(id_list)
Sorry!:) No result found.
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