Copy and Edit

C170 Alternate Test

Description

Alternate practice test for C170 WGU
Craig Willey
Quiz by Craig Willey, updated more than 1 year ago
Craig Willey
Created by Craig Willey over 5 years ago
88
1
0

Resource summary

Question 1

Question
A customer can purchase many products and a product can be purchased by many customers. Which kind of binary relationship does this scenario describe?
Answer
  • Many-to-many
  • One-to-many
  • One-to-one binary
  • One-to-one

Question 2

Question
Which kind of relationship is displayed in this entity-relationship diagram?
Image:
1 (binary/octet-stream)
Answer
  • Binary one-to-one
  • Unary many-to-many
  • Ternary one-to-one
  • Binary many-to-many
  • Unary one-to-one
  • Ternary many-to-many

Question 3

Question
Which kind of relationship is displayed in this entity-relationship diagram?
Image:
2 (binary/octet-stream)
Answer
  • One-to-one binary
  • One-to-one unary
  • Many-to-many binary
  • Many-to-many unary

Question 4

Question
How is this portion of the entity-relationship diagram read, from left to right?
Image:
3 (binary/octet-stream)
Answer
  • Only one appointment was scheduled by one patient.
  • One appointment was scheduled by more than one patient.
  • No appointments were scheduled by a patient.
  • At least one appointment is scheduled by a patient.

Question 5

Question
Which two examples are attributes?
Answer
  • A patient ID
  • An appointment number
  • A patient being seen at an appointment
  • An appointment

Question 6

Question
Which delete rule sets column values in a child table to NULL when the matching data is deleted from the parent table?
Answer
  • Restrict
  • Set-to-Null
  • Cascade
  • Matching

Question 7

Question
A patient is related to two exam records. The table follows the restrict delete rule. What happens if someone tried to delete the patient?
Image:
4 (binary/octet-stream)
Answer
  • The lack of a patient connected to the exam records is flagged for later.
  • The delete occurs immediately.
  • The delete is not allowed.
  • Another patient is linked with the exam records.

Question 8

Question
Which two columns are created as something other than variable-length strings in the statement above? Choose 2 answers
Image:
5 (binary/octet-stream)
Answer
  • activity_id
  • activity_name
  • activity_date
  • time
  • location
  • coordinator_id

Question 9

Question
The database table above has 7 different physician IDs in the first column and physician_id is the primary key of the table. There are 7 different physician names in the second column. The third column indicates which site a physician is located at. There are 3 different sites. Two of the site names are repeated 3 times. Which action should be used to translate this data into third normal form?
Image:
6 (binary/octet-stream)
Answer
  • Move the data from the second column into the third column
  • Move the data from the third column into its own table.
  • Move the data from the third column into the first column.
  • Move the data from the first two columns into separate tables.

Question 10

Question
A database designer is working through the normalization process. A simple primary key has been established. All of the repeating groups and multi-valued fields have been removed In which form is this table:
Image:
7 (binary/octet-stream)
Answer
  • First Normal Form
  • Second Normal Form
  • Third Normal Form
  • Unnormalized

Question 11

Question
Two attributes in two related tables have the exact same domain of values. The attribute is a primary key (PK) in one table. Which kind of key is the attribute in the other table?
Image:
8 (binary/octet-stream)
Answer
  • Foreign
  • Composite
  • Primary
  • Compound

Question 12

Question
In this entity-relationship diagram, many instructors are shown as working at a minimum of one campus. How is the relationship between instructors and campuses represented in the diagram?
Image:
9 (binary/octet-stream)
Answer
  • It is undefined.
  • It is linked through the instructor_id
  • It is indicated by the tables’ adjacency.
  • It is linked through the campus_id.

Question 13

Question
In which two ways can data redundancy affect managing disk storage space and calculation speed? Choose 2 answers:
Answer
  • Additional processing time is needed to update redundant data.
  • Additional processing time is needed to find intersection data for each redundant piece of data
  • Redundant data must be processed as unary, binary, and ternary information.
  • Redundant data takes up additional disk space.
  • Every copy of redundant data must be copied to a third record in the database

Question 14

Question
With which command can a database administrator allow a user named Mary to query the Patient table by executing SELECT commands on it?
Answer
  • GRANT Patient TO ‘mary’@ ‘localhost’;
  • GRANT SELECT ON PATIENT TO ‘mary’@ ‘localhost’;
  • GRANT SELECT PATIENT TO ‘mary’@ ‘localhost’;
  • GRANT PATIENT ON SELECT TO ‘mary’@ ‘localhost’;

Question 15

Question
Why does MySQL’s architecture use concurrency control?
Answer
  • To prevent two users from viewing the same record during potential updates.
  • To ensure that users are logged in on a local machine.
  • To let multiple clients easily find and negotiate with each other.
  • To prevent two users from modifying the same record at the same time.

Question 16

Question
Which command creates a database only if it does not already exist?
Answer
  • CREATE DATABASE IF NOT EXISTS db_name;
  • IF NOT EXISTS CREATE DATABASE db_name;
  • IF NOT EXISTS db_name;
  • CREATE DATABASE IF NEW db_name;

Question 17

Question
Refer to the given SQL statement: SELECT item_number, item_name FROM item Which line should be added to the end of the statement to return the item numbers and item names for items that have an item_price of 10 dollars?
Answer
  • AND item_price = 20;
  • AND item_price >= 20;
  • WHERE item_price = 20;
  • WHERE item_price >= 20;

Question 18

Question
What does WHERE identify in a basic SQL SELECT statement?
Answer
  • The associative entity
  • A table’s intersection data
  • The rows to be included in the result set
  • A range of included columns

Question 19

Question
Refer to the given SQL statement. SELECT patient_id FROM patient Which line added to the end of the statement returns patient ids of at least 1000?
Answer
  • WHERE patient_id >=1000;
  • WHERE patient_id => 1000;
  • WHERE patient_id = 1000+;
  • WHERE patient_id > 1000;

Question 20

Question
Refer to the given SQL statement: SELECT item_id, SUM(quantity) FROM invoice Which line, when added to the end of the statement, returns the total number of each kind of item by item_id?
Answer
  • SUM item_id;
  • GROUP BY item_id;
  • COUNT item_id;
  • ORDER BY item_id;

Question 21

Question
Which data definition language statement affects databases or objects in them?
Answer
  • NULL
  • INSERT
  • SELECT
  • ALTER

Question 22

Question
What does the DELETE statement do?
Answer
  • It removes rows from a table.
  • It removes columns not named in the column list.
  • It removes views.
  • It removes columns from a table.

Question 23

Question
Which condition must be in effect to use the INSERT INTO … VALUES syntax for an INSERT statement?
Answer
  • The VALUES list must contain a value for each non-null valued column in the table.
  • The VALUES list must contain a value for each attribute/column in the table.
  • The INSERT INTO portion of the statement must generate a LOAD DATA statement.
  • THE INSERT INTO portion of the statement must refer to a sampdb database table.

Question 24

Question
Which kind of data type is FLOAT in the statement?
Image:
10 (binary/octet-stream)
Answer
  • Decimal
  • Integer
  • Data
  • String

Question 25

Question
Which two MySQL data types can represent images or sounds? Choose two
Answer
  • TINYBLOB
  • FLOAT
  • BINARY
  • TERNARY
  • INT
  • SOUNDBLOB

Question 26

Question
Refer to the given SQL statement. CREATE TABLE Invoice ( invoice_id INT NOT NULL , date DATE NOT NULL, customer_id INT NOT NULL, PRIMARY KEY (invoice_id), FOREIGN KEY (customer_id) REFERENCES Customer (customer_id) ); In which line of the statement is the table given its name?
Answer
  • customer_id INT NOT NULL,
  • PRIMARY KEY (invoice_id),
  • CREATE TABLE Invoice (
  • FOREIGN KEY (customer_id) REFERENCES Customer (customer_id)

Question 27

Question
Which method creates an empty copy of a table and then populates it from the original table?
Answer
  • CREATE TABLE new_tbl_name INTO tbl_name; INSERT INTO new_tbl_name;
  • INSERT TABLE new_tbl_name SELECT tbl_name; INSERT INTO new_tbl_name LIKE tbl_name;
  • CREATE TABLE new_tbl_name LIKE tbl_name; INSERT INTO new_tbl_name SELECT * FROM tbl_name;
  • INSERT TABLE new_tbl_name LIKE tbl_name; SELECT tbl_name;

Question 28

Question
Refer to the given MySQL syntax. ALTER TABLE tbl_name action [, action ] … ; What does this syntax allow? Choose two answers:
Answer
  • Changing storage space
  • Changing column data types
  • Dropping indexes
  • Adding rows

Question 29

Question
Which command eliminates a table?
Answer
  • TRUNCATE TABLE
  • DELETE TABLE
  • REMOVE TABLE
  • DROP TABLE

Question 30

Question
Why is a view used to give controlled access to data?
Answer
  • To limit many-to-many relationship between various entities and attributes
  • To restrict access to persons retrieving and modifying sensitive information
  • To move complicated security routines to subqueries
  • To add complexity to encryption techniques

Question 31

Question
Which data definition language statement affects databases or objects in them?
Answer
  • SELECT
  • INSERT
  • ALTER
  • NULL

Question 32

Question
Refer to the given SQL statement. SELECT customer_id, customer_last_name, customer_first_name FROM customer; Which statement, when added before this statement, generates a view?
Answer
  • ALTER custview AS
  • WHERE VIEW custview IS
  • CREATE VIEW custview AS
  • VIEW custview

Question 33

Question
What is the proper command to change a view?
Answer
  • ALTER VIEW
  • CHANGE VIEW
  • MODIFY VIEW
  • UPDATE VIEW

Question 34

Question
DROP VIEW patient_view; What happens as a result of the execution of this statement to the patient table on which patient_view is based?
Answer
  • Unauthorized access to the view is restricted
  • The view is discarded
  • The data is discarded
  • The patient table data is discarded

Question 35

Question
Which optional clause added to a GRANT statement enables the account to give its own privileges to other uses?
Answer
  • TO
  • WITH GRANT OPTION
  • REQUIRE
  • FOR

Question 36

Question
When a patient is deleted from the patient table, all corresponding rows from the patient in the exam table are automatically deleted as well. What is this referential integrity technique called?
Answer
  • Cascaded delete
  • Foreign key constraint
  • Referential delete
  • Dynamic update

Question 37

Question
Which clause should be added to the end to make the invoice_id attribute the primary key within a CREATE TABLE statement?
Image:
11 (binary/octet-stream)
Answer
  • PRIMARY KEY (invoice_id));
  • PRIMARY KEY = (invoice_id));
  • (PRIMARY KEY): invoice_id;
  • (PRIMARY KEY) = (invoice_id));

Question 38

Question
Which statement should be used to establish a foreign key on customer_id?
Answer
  • FOREIGN KEY (customer_id) (index_columns)
  • FOREIGN KEY (customer_id) REFERENCES customer (customer_id)
  • FOREIGN KEY [table_name](customer_id)
  • FOREIGN KEY = (customer_id) REFERENCES customer (customer_id)

Question 39

Question
Which ALTER TABLE statement adds a foreign key constraint to a child table?
Answer
  • ALTER TABLE child ADD FOREIGN KEY (parent_id) ON DELETE CASCADE;
  • ALTER TABLE child ADD FOREIGN KEY WHERE parent (parent_id) ON DELETE CASCADE;
  • ALTER TABLE child ADD FOREIGN KEY (parent_id) REFERENCES parent (parent_id) ON DELETE CASCADE;
  • ALTER TABLE child ADD FOREIGN KEY (parent_id) WHERE parent (parent_id) ON DELETE CASCADE;

Question 40

Question
The database administrator has been tasked with implementing an index to speed up the retrieval of data based on the V_STATE values. The database is using the InnoDB engine. What is the correct syntax to create an index to be built on the V_STATE field based on the database information?
Image:
12 (binary/octet-stream)
Answer
  • ALTER TABLE ‘Vendor’ ADD UNIQUE INDEX ‘state_index (‘V_STATE’);
  • ALTER TABLE Vendor ADD INDEX ‘state_index’ (‘V_STATE’);
  • CREATE UNIQUE INDEX state_index ON Vendo (V_STATE) USING HASH;
  • CREATE INDEX state_index USING HASH ON Vendor (V_STATE);

Question 41

Question
Which clause when added to the end of the statement creates and index on the customer_id field?
Image:
13 (binary/octet-stream)
Answer
  • INDEX custid_index (customer_id));
  • INDEX = (customer_id);
  • INDEX = (customer_id));
  • SET INDEX custid_index (customer_id));

Question 42

Question
Which syntax is the correct way to use the DROP INDEX command to drop a primary key from a table?
Answer
  • DROP INDEX ‘PRIMARY’ ON tbl_name;
  • DROP INDEX WHERE PRIMARY KEY = ON tbl_name;
  • DROP INDEX ‘PRIMARY KEY’ ON tbl_name;
  • DROP INDEX PRIMARY KEY tbl_name;

Question 43

Question
A database administrator tried to delete a row in a parent table, but the delete fails because a row in another table depends on that row. Which referential-integrity rule is in effect?
Answer
  • The set-to-null delete rule
  • The restrict rule
  • The default delete rule
  • The cascade delete rule

Question 44

Question
Refer to the given MySQL statement. INSERT INTO Invoice VALUES (10217, ‘2018-08-01’, 55527), (10218, ‘2018-08-01’, 44436); Describe what the parentheses denote.
Answer
  • The row values for two individual columns
  • The attributes that are changeable
  • The column values for two individual rows
  • The data to be duplicated.

Question 45

Question
Which statement deletes all rows from the invoice table?
Answer
  • DELETE FROM Invoice WHERE invoice_id = *;
  • DELETE FROM Invoice;
  • DELETE FROM Invoice WHERE invoice_id == *;
  • DELETE ALL FROM Invoice;

Question 46

Question
Refer to the given SQL statement. SELECT table1.*, table2.* FROM table1 LEFT JOIN table2 ON table1.column_name = table2.column_name;
Answer
  • It selects only the rows in Table 1 that are the same as Table 2
  • It selects the rows in both Tables that have numerical data that is left-aligned.
  • It selects the rows in Table 1 numbered the same as Table 2.
  • It selects all of the rows in Table 1 (regardless of if there is a match in Table 2) and the matching rows in Table 2.

Question 47

Question
Refer to the given SQL Statement. 1. SELECT invoice_id 2. FROM Invoice 3. WHERE customer_id = 4. FROM customer 5. WHERE customer_id = 55547); What is missing from the subquery at the beginning of Line 4?
Answer
  • (SUBQUERY = customer_id
  • (FIND customer_id
  • (SELECT customer_id
  • (SUBQUERY customer_id
Show full summary Hide full summary

Want to create your own Quizzes for free with GoConqr? Learn more.

Similar

Unit 1 Sociology: Family Types
ArcticCourtney
Application of technology in learning
Jeff Wall
IB Chem Flashcards
j. stu
My SMART School Year Goals for 2015
Stephen Lang
Hitler's Chancellorship
c7jeremy
MATTERS OF LIFE AND DEATH - UNIT 1, SECTION 2 - RELIGIOUS STUDIES GCSE EDEXCEL
Khadijah Mohammed
MICROSOFT WORD 2013 SKILLS FOR WORK
John O'Driscoll
What You Can Do Using GoConqr
Micheal Heffernan
CCNA Security 210-260 IINS - Exam 1
Mike M
SalesForce ADM 201 Study Quiz
Brianne Wright
Topic
TEL Bath
Browse Library