
AP CSA |U2 L3 Attributes by Mr. B
Authored by Cyber Professor - Mr. B
Computers
12th Grade
Used 2+ times

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30 questions
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1.
MULTIPLE SELECT QUESTION
2 mins • 3 pts
Which of these relational operators are part of the JOIN operator? Select all that apply.
SELECT
PROJECT
PRODUCT
UNION
2.
MULTIPLE SELECT QUESTION
2 mins • 3 pts
Which of these are part of the rule of entity integrity? Select all that apply.
Primary keys must have unique tuples.
Primary keys cannot have null values.
Primary keys can only have one attribute.
Prime attributes must be the first attributes in a table.
3.
MULTIPLE CHOICE QUESTION
2 mins • 3 pts
What is Instance Variables
Variables defined in a class, but not in constructors
Variables of a class that are shared between it’s instances
The blueprint/definer of objects and contain functions, called methods available only to objects of that type
Encapsulates instance attributes
4.
MULTIPLE CHOICE QUESTION
2 mins • 3 pts
Address is a good name for an Entity
True
False
5.
MULTIPLE CHOICE QUESTION
2 mins • 3 pts
Instances must always be mandatory
True
False
6.
MULTIPLE CHOICE QUESTION
2 mins • 3 pts
Consider a table 'students' with three attributes: 'student_id', 'last_name', and 'first_name'. Assume some students have the same last name, and some students have the same first name. How many candidate keys are there?
two
three
four
five
7.
MULTIPLE CHOICE QUESTION
2 mins • 3 pts
What is a subclass
Tests out code and can run with errors
Where the class gains attributes and methods of another
Argument defined as variables under a function
A type a class that is specified under a normal class, inheriting the features of the normal class
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