Data BitsModels

Classes & Schemes

Rows & Tables Keys

Associations

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Final DataBit

$100 Answer from Models

This modeling language was developed for software engineering of large

systems using object-oriented programming languages. We use it for

modeling the enterprise.

$100 Question from Models

What is the Unified Modeling Language (UML)?

$200 Answer from Models

This model is similar to UML, but is used primarily in database

development rather than software engineering.

$200 Question from Models

What is the Entity-Relationship (ER) model?

$300 Answer from Models

CATEGORY 1 - $300

This is the formal mathematical model of a relational database.

$300 Question from Models

What is the Relational Model?

$400 Answer from Models

This formal language is used to symbolically manipulate objects of the

relational model.

$400 Question from Models

What is Relational Algebra?

$500 Answer from Models

This is the informal set of terms for relational model objects, used most

often in database work.

$500 Question from Models

What is the table model?

$100 Answer from Classes & Schemes

This is any "thing" in the enterprise that is to be represented in the database by a UML model. (It is called an entity in

the ER model.)

$100 Question from Classes & Schemes

What is a UML class?

$200 Answer from Classes & Schemes

This is any "thing" in the enterprise that is to be represented in the database by

an ER model. (It is called a class in UML.)

$200 Question from Classes & Schemes

What is an ER model entity?

$300 Answer from Classes & Schemes

This is one piece of information that characterizes each member of a class

or entity type.

$300 Question from Classes & Schemes

What is an attribute? (UML, ER, RM)

$400 Answer from Classes & Schemes

This is an attribute that provides real-world information, relevant to the

enterprise, about the class that we are modeling.

$400 Question from Classes & Schemes

What is a descriptive attribute?

$500 Answer from Classes & Schemes

This is a set of attributes, with an assignment rule. It provides the structure for a database table.

$500 Question from Classes & Schemes

What is a relation scheme?

$100 Answer from Rows & Tables

This contains information about one individual in a database table. (It is

called a tuple in the relational model.)

$100 Question from Rows & Tables

What is a (table model) row?

$200 Answer from Rows & Tables

This function assigns a constant value from the attribute domain to each

attribute in a relation scheme. (It is called a row in the table model.)

$200 Question from Rows & Tables

What is a (relational model) tuple?

$300 Answer from Rows & Tables

This set of rows represents all of the individual in a class. (It is called a relation in the relational model.)

$300 Question from Rows & Tables

What is a (tablel model) table?

$400 Answer from Rows & Tables

This set of tuples contains the information for all individuals in a class. (It is called a table in the table model.)

$400 Question from Rows & Tables

What is a (relational model) relation?

$500 Answer from Rows & Tables

This special constant value is compatible with any data type and means "this field doesn't have any

value assigned to it."

$500 Question from Rows & Tables

What is NULL?

$100 Answer from Keys

This can be any set of attributes in a relation whose values, taken together, guarantee uniqueness of the rows in a

table.

$100 Question from Keys

What is a super key?

$200 Answer from Keys

This minimal super key can't have an attribute deleted without losing the

super key property, or added without losing its distinction.

$200 Question from Keys

What is a candidate key?

$300 Answer from Keys

This candidate key is picked by the database designer to guarantee

uniqueness of each row in a table.

$300 Question from Keys

What is a primary key?

$400 Answer from Keys

This made-up primary key has no descriptive value about an

individual.

$400 Question from Keys

What is a surrogate key?

$500 Answer from Keys

This made-up primary key has at least some descriptive value about an

individual.

$500 Question from Keys

What is a substitute key?

$100 Answer from Associations

The minimum and maximum number of individuals of one class that may be associated with a single member of

another class. (Called cardinality in ER, RM and table model)

$100 Question from Associations

What is multiplicity? (UML)

$200 Answer from Associations

The way that two classes are functionally connected to each other.

(Called a relationship in the ER model.)

$200 Question from Associations

What is an association? (UML)

$300 Answer from Associations

The way that two entities are functionally connected to each other.

(Called an association in UML.)

$300 Question from Associations

What is a relationship? (ER model)

$400 Answer from Associations

This association has a maximum multiplicity of 1..*

$400 Question from Associations

What is a one-to-many association?

$500 Answer from Associations

This set of attributes is copied from the PK of a parent table into the scheme of

a child table.

$500 Question from Associations

What is a foreign key?

Final DataBitThis computer scientist developed the relational model

database for IBM in the 1970s.

Final DataBit

Who is Dr. E.F. Codd?