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Secondary UID's are

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Cards (144)

Section 1

(50 cards)

Secondary UID's are

Front

Useful as an alternative means of identifying instances of an entity

Back

How do you turn "data" into "information"?

Front

By querying it or accessing it

Back

If subtypes are listed, a supertype should have at least two subtypes. True or False?

Front

T

Back

Which of the following are examples of data vs. information:

Front

- Student age vs. average age of all students in class - Bank deposit amount vs. total account balance - Price of a computer vs. total sales of all computers for a company

Back

Personal computers (PCs) have been in existence since 1950. True or False?

Front

F

Back

Which of the following is the best scenario for using supertype/subtype entities:

Front

A vehicle dealership that sells boats on trailers, cars, and trucks

Back

Non-transferable relationships can only be mandatory, not optional. True or False?

Front

F

Back

An entity can be on 2nd Normal Form even if it has repeated values. True or False?

Front

F

Back

Many-to-Many relationships are perfectly acceptable in a finished ERD. There is no need to do any more work on them. True or False?

Front

F

Back

The overall mission of the Oracle Corporation is to use the internet and fast processing servers to build its own network

Front

F

Back

Which of the following represents the correct sequence of steps in the Database Development Process?

Front

Analyze, Design, Build

Back

Modeling historical data can produce a unique identifier that includes a date. True or False?

Front

T

Back

All attributes that are part of the UID are mandatory. True or False?

Front

T

Back

Relationships always exist between

Front

2 entities (or one entity and itself)

Back

To visually represent exclusivity between two or more relationships in an ERD you would most likely use a/an ________.

Front

Arc

Back

Oracle was one of the first relational database systems available commercially. True or False?

Front

T

Back

Which of the following is an example of a structural business rule?

Front

All employees must belong to at least one department

Back

If a relationship can be moved between instances of the entities it connects, it is said to be:

Front

Transferable

Back

A business rule such as "All accounts must be paid in full within 10 days of billing" is best enforced by:

Front

Hiring a programmer to create additional programming code to identify and report accounts past due

Back

What are the three properties that every relationship should have?

Front

Name, optionality, cardinality

Back

Examine the following entity and decide which attribute breaks the 2nd Normal Form rule: ENTITY: CLASS ATTRIBUTES: CLASS ID DURATION SUBJECT TEACHER NAME AND ADDRESS

Front

TEACHER NAME AND ADDRESS

Back

Which of the following would best be represented by an arc?

Front

STUDENT ( University, Trade School)

Back

No database in the world is ever truly on 3rd Normal Form. Everyone always stops after 2nd Normal Form. True or False?

Front

F

Back

When resolving a M:M relationship, the new relationships will always be __________ on the many side.

Front

Mandatory

Back

Audit trail attributes cannot be placed in the entities they are auditing, they must be placed in separate, new entities, created just for that purpose. True or False?

Front

F

Back

A relationship can be both recursive and hierachal at the same time. True or False?

Front

F

Back

When you resolve a M:M by creating an intersection entity, this new entity will always inherit

Front

A relationship to each entity from the original M:M.

Back

Attributes are written inside the entity to which they belong. True or False?

Front

T

Back

A well structured ERD will show only some parts of the finished data model. You should never try to model the entire system in one diagram, no matter how small the diagram might be. True or False?

Front

F

Back

An entity can only have one UID. True or False?

Front

F

Back

n this simple diagram, what comprises the unique identifier for the student class entity?

Front

student id and course id

Back

All of the following would be instances of the entity PERSON except which?

Front

Male

Back

Data Modeling is the last step in the database development process. True or False?

Front

F

Back

This diagram could also be expressed as a supertype/subtype construction. True or False?

Front

False

Back

Many to many relationships between entities usually hide what? Mark for Review

Front

Another entity

Back

When are relationships unnecessary?

Front

When you can derive the relationship from other relationships in the model

Back

What uncommon relationship is described by the statements: "Each LINE must consist of many POINTS and each POINT must be a part of many LINES"

Front

Many to Many Mandatory

Back

Entity names are always plural. True or False?

Front

F

Back

A unique identifier can only be made up of one attribute. True or False?

Front

F

Back

When data is stored in more than one place in a database, the database violates the rules of ___________.

Front

Normalization

Back

If an intersection entity is formed that contains no attributes of its own, its uniqueness may be modeled by

Front

Barring the relationships to the original entities.

Back

The following entity is in 1st normal form: True or False? ENTITY: VEHICLE ATTRIBUTES: REGISTRATION MAKE MODEL COLOR DRIVER PASSENGER 1 PASSENGER 2 PASSENGER 3

Front

F

Back

Changes in computing have affected many of our day-to-day activities. Are all of the following activities examples of this change? Yes or No?In the past you used to use the phone system to call directory assistance to get a phone number. Today you can use your PC to look up a phone number online.In the past you used to have to go to the shoe store to buy shoes. Today you can use your PC to order shoes online.In the past you had to use your PC to send a person an email. Today you can use your phone to send a text message.

Front

YES

Back

As a database designer, you have a responsibility to store data in only one place and in the best possible place. True or False?

Front

T

Back

A non-transferable relationship is represented by which of the following symbols?

Front

Diamond

Back

Consider the recommended drawing conventions for ERD's. Indicate which of the following accurately describes diagramming conventions for entities and attributes:

Front

The * means that an attribute is mandatory or required; the entity name should be singular

Back

Which of the following is a TRUE statement about the diagram below?

Front

Every A is a B

Back

When all attributes are single-valued, the database model is said to conform to:

Front

1st Normal Form

Back

Which of the following is the definition for Third Normal Form?

Front

No non-UID attribute can be dependent on another non-UID attribute

Back

What is the rule of Second Normal Form?

Front

All non-UID attributes must be dependent upon the entire UID.

Back

Section 2

(50 cards)

Which of the following SQL statements will display the title and cost of each book stored in the BOOKS table, as well as the name of the contact person and the phone number to call to reorder the book?

Front

SELECT title, cost, contact, phone FROM publisher JOIN books USING (pubid);

Back

Which of the following SQL statements will display the gift that should be sent to any customer who orders the book titled SHORTEST POEMS?

Front

SELECT gift FROM promotion, books WHERE retail BETWEEN minretail AND maxretail AND title = 'SHORTEST POEMS';

Back

Parentheses can be used to override the order of operations in an arithmetic expression

Front

T

Back

If you are tracking employment dates for an employee, do you need to have an "End Date" attribute?

Front

Yes, if the company wants to track multiple start dates and insure that multiple employment dates for an employee do not overlap

Back

In a Cartesian join, linking a table that contains 10 rows to a table that contains 9 rows will result in ____ rows being displayed in the output

Front

90

Back

Based upon the contents of the BOOKS table, which of the following SQL statements will display five rows in its results?

Front

SELECT DISTINCT pubid FROM books;

Back

Based upon the contents of the BOOKS table in the accompanying figure, which of the following queries will retrieve all books published in 2001?

Front

SELECT * FROM books WHERE pubdate BETWEEN '01-JAN-01' AND '31-DEC-01'; SELECT * FROM books WHERE pubdate LIKE '%01'; SELECT * FROM books WHERE pubdate >= '01-JAN-01' AND pubdate <= '31-DEC-01';

Back

Which of the following is a valid SQL statement to retrieve data from the ORDERS table?

Front

SELECT order#, orderdate, shipdate FROM orders;

Back

A(n) ____ is used to combine the results of two queries

Front

set operator

Back

In a payroll system, it is desirable to have an entity called DAY with a holiday attribute when you want to track special holidays. True or False?

Front

T

Back

A barrred Relationship will result in a Foreign Key column that also is part of:

Front

The Primary Key

Back

When the WHERE clause contains multiple types of operators, which of the following is resolved last?

Front

logical operators

Back

When sorting the results in descending order, which of the following values will be presented first in the output?

Front

NULL

Back

Use MON in the format argument to spell out the specified month.

Front

F

Back

A foreign key always refers to a primary key in the same table. True or False?

Front

F

Back

Relationships on an ERD can only be transformed into UIDs in the physical model? True or False?

Front

F

Back

The "Arc Implementation" is a synonym for what type of implementation?

Front

Supertype and Subtype Implementation

Back

All data models MUST include generic components in order to remain flexible. True or False?

Front

F

Back

Which of the following is true?

Front

Date values are enclosed in single quotation marks

Back

The SORT BY clause is used for displaying the results of a query in a sorted order.

Front

F

Back

The explanation below is an example of which constraint type? A column must contain only values consistent with the defined data format of the column

Front

Column integrity

Back

Each section of a SQL command that begins with a keyword is known as a statement.

Front

F

Back

A table alias is assigned in the FROM clause.

Front

T

Back

No formal rules exist for drawing ERD's. The most important thing is to make sure that all entities, attributes, and relationships are documented on the diagram. The Layout is insignificant. True or False?

Front

F

Back

A(n) non-equality join is used when there are no equivalent rows of data in the tables that are being joined.

Front

T

Back

The percent sign (%) and underscore (_) symbols can be used with the LIKE comparison operator to create a search pattern.

Front

T

Back

The transformation from an ER diagram to a physical design involves changing terminology. Entities in the ER diagram become __________ , and attributes become ____________.

Front

Tables, Columns

Back

Why would you want to model a time component when designing a system that lets people buy bars of gold?

Front

The price of gold fluctuates and, to determine the current price, you need to know the time of purchase

Back

Table aliases MUST be used with columns referenced in the JOIN USING clause. True or False?

Front

F

Back

Modeling historical data produces efficient ways for a business to operate such as:

Front

Providing valuable information via reports to management.

Back

The JOIN keyword is used in the WHERE clause to indicate the tables that should be joined or linked.

Front

F

Back

A table does not have to have a primary key. True or False?

Front

T

Back

Choosing specific columns to be displayed by a SELECT statement is known as selection

Front

F

Back

In an ERD, it is a good idea to group your entities according to the expected volumes. By grouping high volume entities together, the diagrams could become easier to read. True or False?

Front

T

Back

What is used to indicate the end of an SQL statement?

Front

;

Back

How do you know when to use the different types of time in your design?

Front

It depends on the functional needs of the system.

Back

The transformation from an ER diagram to a physical design involves changing terminology. Relationships in the ER diagram become __________ , and primary unique identifiers become ____________.

Front

Foreign keys, Primary keys

Back

Which of the following commands can be used to view the structure of a table?

Front

DESCRIBE

Back

When you add the concept of time to your data model, you are:

Front

Adding complexity to your model.

Back

The SORT BY clause is used to present query results in a specific order.

Front

F

Back

Based upon the structure of the ORDERS table, which of the following is a valid SQL statement?

Front

SELECT order#, orderdate DateOrdered FROM orders;

Back

How can you write "not equal to" in the WHERE-clause?

Front

!= ^= <>

Back

When sorting the results in ascending order, which of the following values will be presented last in the output?

Front

NULL

Back

Which of the following types of joins refers to joining a table to itself?

Front

self-join

Back

Attributes become columns in a database table. True or False?

Front

T

Back

Which of the following clauses is used to restrict the rows returned by a query?

Front

WHERE

Back

Combining the contents of two or more columns is known as ____.

Front

concatenation

Back

Generic models are generally less complex than a specific model. True or False?

Front

F

Back

In a physical data model, a relationship is represented as a:

Front

Foreign Key

Back

The SQL statement ALTER TABLE EMPLOYEES DROP COLUMN SALARY will delete all of the rows in the employees table. True or False?

Front

F

Back

Section 3

(44 cards)

The purpose of an ERD is to document the proposed system and facilitate discussion and understanding of the requirements captured by the developer. True or False?

Front

T

Back

Why is it important to identify and document business rules?

Front

It allows you to create your data model, then check for accuracy.

Back

A single-row subquery can return several columns, but only one row, of results to the outer query.

Front

F

Back

What is the default mode for the CREATE VIEW command?

Front

NOFORCE

Back

With a MERGE statement, a series of ____ actions can occur with a single SQL statement.

Front

DML

Back

Which of the following types of views cannot contain grouped data?

Front

simple

Back

Based on the contents of the CUSTOMERS table, which SQL statement will display the customers residing in the same state as customer#1013?

Front

SELECT customer# FROM customers WHERE state = (SELECT state FROM customers WHERE customer#=1013);

Back

Which of the following functions can be used to substitute another value for a NULL value during calculations?

Front

NVL

Back

The ____ constraint ensures that any DML operations performed on the view (e.g., adding rows, changing data) will not prevent the row from being accessed by the view because it no longer meets the condition in the WHERE clause.

Front

WITH CHECK OPTION

Back

Based on the contents of the BOOKS table, which of the following SQL statements will return the total profit generated by books provided by publisher 4?

Front

SELECT SUM(retail-cost) FROM books WHERE pubid = 4;

Back

When you resolve a M-M by creating an intersection entity, this new entity will always inherit:

Front

A relationship to each entity from the original M-M.

Back

Multiple-row subqueries are nested queries that can return more than one row of results to the parent query.

Front

T

Back

The MAX function can be used with which type of columns?

Front

all of the above

Back

Rows cannot be added to a table through a complex view that is based on a group function.

Front

T

Back

Which of the following format model elements can be used to spell out a number?

Front

SP

Back

Based upon the contents of the BOOKS tables, which of the following SQL statements will return the number of different publishers represented in the table?

Front

SELECT COUNT(DISTINCT pubid) FROM books;

Back

Which of the following types of views cannot include a group function?

Front

simple view

Back

An outer query is also referred to as a(n) ____ query.

Front

parent query

Back

The ____ function is based upon the concept of a normal distribution.

Front

STDDEV

Back

If the DISTINCT keyword is not included in the SUM function, the ____ keyword will be assumed.

Front

UNIQUE RANDOM

Back

You can determine the number of characters in a column by using the COUNT function.

Front

F

Back

The YR element can be included in a format argument of the TO_CHAR function to spell out the year of the specified date.

Front

F

Back

You must make sure all entities of a proposed system can fit onto one diagram. It is not allowed to break up a data model into more than one diagram

Front

F

Back

Which of the following is true about supertypes and subtypes?

Front

Subtypes inherit the relationships and attributes of the supertype (*)

Back

Which of the following describes a type of view that is based on a subquery that retrieves or derives data from one or more tables, and may also contain functions or grouped data?

Front

complex view

Back

The default keyword for group functions is ____.

Front

ALL

Back

If it is possible for a subquery to return a NULL value to the outer query for comparison, the ____ function should be used to substitute an actual value for the NULL.

Front

NVL

Back

With the following data in Employees (last_name, commission_pct, manager_id) what is the result of the following statement? DATA: King, null, null Kochhar, null, 100 Vargas, null, 124 Zlotkey, .2, 100

Front

King, -1 Kochhar, 100 Vargas, 124 Zlotkey, .2

Back

In Oracle11g, a MERGE statement compares data between two tables and can perform a series of DML actions to assist in synchronizing the data of the two tables.

Front

T

Back

he > operator is referred to as a(n) ____ operator.

Front

single-row

Back

Group functions return a group of results per row processed.

Front

F

Back

Rows cannot be added to a table through a complex view that was created with the ORDER BY clause.

Front

F

Back

The AVG function only includes non-NULL values in its calculations.

Front

T

Back

All instances of a subtype must be an instance of the supertype. True or False?

Front

T

Back

If a SELECT statement contains HAVING, GROUP BY, and WHERE clauses, the ____ clause will be processed last.

Front

HAVING

Back

The operators =, <, >, <=, >=, and <> are referred to as ____ operators.

Front

single-row

Back

If the DISTINCT keyword is not included in the STDDEV function, the ____ keyword will be assumed.

Front

AVG SUM NVL

Back

Which of the following format argument elements indicates that the name of the day of the week for the specified date should be displayed?

Front

DAY

Back

A subtype can have a relationship not shared by the supertype. True or False?

Front

T

Back

Which of the following functions allows for different options, depending upon whether a NULL value exists?

Front

NVL2

Back

he subquery used to create a(n) ____ view can contain an ORDER BY clause.

Front

inline

Back

DML operations are not allowed on a view that includes the pseudo column ____.

Front

ROWNUM

Back

Single-row functions return one result per group of rows processed.

Front

F

Back

A(n) UPDATE operation can be performed on a complex view that contains an arithmetic operation.

Front

T

Back