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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. Lookup type that returns results greater than a given value.
Entry.objects.filter(id__gt=4)
model
gt
istartswith
2. 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.
ManyToManyField
id field
pk
iregex
3. If you pickle a QuerySet - this will force all the results to be loaded into memory prior to pickling. When you unpickle a QuerySet - it contains the results at the moment it was pickled - rather than the results that are currently in the database.
one-to-one relationship
pickling
isnull
istartswith
4. 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.
Q(question__istartswith='What')
gte
get_or_create(**kwargs)
reverse()
5. When to run syncdb
order_by(*fields)
Q()
Entry.objects.filter(pub_date__range=(start_date - end_date))
when you add new apps to INSTALLED_APPS
6. This tells Django how to calculate the URL for an object. Django uses this in its admin interface - and any time it needs to figure out a URL for an object.
get(**kwargs)
range
values(*fields)
get_absolute_url()
7. Returns a ValuesQuerySet -- a QuerySet that returns dictionaries when used as an iterable - rather than model-instance objects.
values(*fields)
Manager methods
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
gt
8. This query finds all entries with an id in the list [1 - 3 - 4]
Entry.objects.filter(id__in=[1 - 3 - 4])
reverse()
==
iteration
9. 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.
Entry.objects.filter(pub_date__year=2005).delete()
&
exact
aggregate(args - *kwargs)
10. Returns the most recent object in the table - by date - using the field_name provided as the date field.
istartswith
values_list(*fields)
latest(field_name=None)
exists()
11. These are specified as keyword arguments to the QuerySet methods filter() - exclude() and get(). These take the form field__lookuptype=value .
delete()
filter(**kwargs)
Field lookups
intermediate models
12. 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.
values_list(*fields)
delete()
Field lookups
Manager
13. Lookup type that returns results with a case-sensitive start sequence.
regex
startswith
reverse name
iexact
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)
Model metadata
choices tuple
none()
distinct()
15. 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.
evaluation
iregex
filter chaining
using(alias)
16. This represents a collection of objects from your database. It can have zero - one or many filters.
slicing
QuerySet
in
get(**kwargs)
17. This model method saves a model instance to the database. This method has no return value.
distinct()
reverse()
model
save()
18. 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
Abstract base class
contains
exact
Meta class
19. 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.
Proxy model
filter(**kwargs)
exact
update(**kwargs)
20. If True - the table does not permit duplicate values for this field.
gt
ManyToManyField
unique
filter
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
filter
Proxy model
update()
annotate(args - *kwargs)
22. A convenience method for constructing an object and saving it all in one step.
lte
create(**kwargs)
filter
gt
23. 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
exists()
defer(*fields)
values(*fields)
gte
24. 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.
Many-to-many relationship to self
filter(**kwargs)
iregex
get(**kwargs)
25. This method is more or less the opposite of defer(). You call it with the fields that should not be deferred when retrieving a model. If you have a model where almost all the fields need to be deferred - using this method to specify the complementary
only(*fields)
|
Manager
endswith
26. Returns the object matching the given lookup parameters
defer(*fields)
Q()
range
get(**kwargs)
27. Lookup type for date/datetime fields that finds an exact month match. Takes an integer 1 (January) through 12
Abstract base class
isnull
dates(field - kind - order='ASC')
month
28. An iterable (e.g. - a list or tuple) of 2-tuples to use as options for this field. If this is given - Django's admin will use a select box instead of the standard text field and will limit options to those given.
regex
choices
filter chaining
aggregate(args - *kwargs)
29. 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.
Multi-table inheritance
Q(question__istartswith='What')
all()
Manager
30. Returns a new QuerySet that uses SELECT DISTINCT in its SQL query. This eliminates duplicate rows from the query results.
Entry.objects.filter(pub_date__year=2007).update(headline='Everything is the same')
reverse name
related_name
distinct()
31. True if the QuerySet has an order_by() clause or a default ordering on the model. False otherwise.
Manager methods
ordered
startswith
contains
32. 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
33. Lookup type that finds a case-sensitive regular expression match.
regex
aggregate(args - *kwargs)
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
Abstract base class
34. This query deletes all Entry objects with a pub_date year of 2005.
intermediate models
Model metadata
Entry.objects.filter(pub_date__year=2005).delete()
defer(*fields)
35. Returns an integer representing the number of objects in the database matching the QuerySet. This never raises exceptions.
in
Abstract base class
defer(*fields)
count()
36. If this option is True - the field is allowed to be blank. Default is False.
values_list(*fields)
blank
startswith
distinct()
37. 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.
OneToOneField
id field
ForeignKey
aggregate(args - *kwargs)
38. This method immediately deletes the object and has no return value.
using(alias)
help_text
delete()
count()
39. 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.
filter(**kwargs)
only(*fields)
choices tuple
filter chaining
40. 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.
one-to-one relationship
in_bulk(id_list)
in
default
41. If True - this field is the primary key for the model.
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
primary_key
Manager
Entry.objects.filter(id__gt=4)
42. By default - results returned by a QuerySet are ordered by the ordering tuple given by the ordering option in the model's Meta. You can override this on a per-QuerySet basis by using the this method.
in
only(*fields)
Entry.objects.filter(pub_date__year=2005).delete()
order_by(*fields)
43. A Manager method that returns a new QuerySet containing objects that match the given lookup parameters.
filter(**kwargs)
when you add new apps to INSTALLED_APPS
values_list(*fields)
istartswith
44. A convenience method for looking up an object with the given kwargs - creating one if necessary.
gt
filter
gte
get_or_create(**kwargs)
45. This field is added automatically - but this behavior can be overridden
endswith
week_day
id field
Proxy model
46. 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
isnull
filter chaining
through argument
class attributes
47. A QuerySet is iterable - and it executes its database query the first time you iterate over it.
distinct()
Q(question__istartswith='What')
iteration
iexact
48. Operator for comparing two model instances for equality. Behind the scenes - it compares the primary key values of two models.
iteration
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
==
save()
49. If this option is True - Django will store empty values as NULL in the database. Default is False.
pickling
regex
Entry.objects.filter(pub_date__year=2005).delete()
null
50. Fields are specified by these
unique
class attributes
one-to-one relationship
iregex
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