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C170 - Practice Test

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C170 - Database Applications
Craig Willey
Quiz by Craig Willey, updated more than 1 year ago
Craig Willey
Created by Craig Willey almost 5 years ago
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Question 1

Question
A salesperson is authorized to sell many products and a product can be sold by many salespersons. Which kind of binary relationship does this scenario describe?
Answer
  • One-to-one
  • One-to-many
  • Many-to-many
  • One-to-one binary

Question 2

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

Question 3

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

Question 4

Question
How is this portion of the entity-relationship diagram read, from left to right?
Image:
1 (binary/octet-stream)
Answer
  • No books are written by an author.
  • At least one book was written by an author.
  • One book was written by more than one author.
  • Only one book was written by one author.

Question 5

Question
Which two examples are attributes? Choose 2 answers
Answer
  • A person attending a meeting
  • An employee number
  • A sales meeting
  • A meeting code

Question 6

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

Question 7

Question
In this entity-relationship diagram, Salesperson 361 is related to two customers. The table follows the restrict delete rule. What happens if someone tries to delete Salesperson 361 from the customer records?
Image:
2 (binary/octet-stream)
Answer
  • The delete is prohibited.
  • The delete occurs immediately.
  • A new salesperson is assigned instead.
  • The lack of a salesperson is flagged for later.

Question 8

Question
Refer to the given SQL statement. CREATE TABLE member ( member_id INT UNSIGNED NOT NULL AUTO_INCREMENT, PRIMARY KEY (member_id), last_name VARCHAR(20) NOT NULL, first_name VARCHAR(20) NOT NULL, suffix VARCHAR(5) NULL, expiration DATE NULL, email VARCHAR(100) NULL, street VARCHAR(50) NULL, city VARCHAR(50) NULL, state VARCHAR(2) NULL, zip VARCHAR(10) NULL, phone VARCHAR(20) NULL, interests VARCHAR(255) NULL ); Which two columns are created as something other than variable-length strings in this statement? Choose 2 answers
Answer
  • member_id
  • last name
  • suffix
  • expiration
  • email
  • city

Question 9

Question
Employee_ID Employee_Name Office_Address 12342 Jacob 54123 Main Street 12346 Michael 354 Center Avenue 12846 Ethan 54123 Main Street 12887 Joshua 54123 Main Street 12894 Daniel 354 Center Avenue 13097 Alexander 354 Center Avenue 13112 Anthony 54123 Main Street 13411 William 354 Center Avenue 13987 Christopher 354 Center Avenue 13998 Matthew 54123 Main Street This database table has ten different employee numbers in the first column. Employee_ID is the primary key. In addition, it has ten different names in the second column and two office addresses repeated five times each in the third column. Which action should be used to translate this data into third normal form?
Answer
  • Move the data from the third column into the first column.
  • Move the data from the third column into its own table.
  • Move the data from the first two columns into separate tables.
  • Move the data from the second column into the third column.

Question 10

Question
A database manager starts to convert data that has been normalized into a form that conforms to the relational model. A simple primary key has been established and all the repeating groups have been deleted. In which form is this data?
Answer
  • First normal form
  • Second normal form
  • Third normal form
  • Fourth normal form

Question 11

Question
Two attributes in two related tables have the exact same domain of values. The attribute is a primary key in one table. Which kind of key is the attribute in the other table?
Answer
  • Foreign
  • Primary
  • Compound
  • Composite

Question 12

Question
In this entity-relationship diagram, many salespersons are shown as working in at least one office. How is the relationship between salespersons and offices represented in the diagram?
Image:
3 (binary/octet-stream)
Answer
  • It is undefined.
  • It is linked through the office ID.
  • It is linked through the salesperson ID.
  • It is indicated by the tables’ adjacency.

Question 13

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

Question 14

Question
Refer to the given SQL statement. SELECT PRODNUM, PRODNAME FROM PRODUCT Which line should be added to the end of the statement to return the product numbers and product names for products that cost 20 dollars?
Answer
  • WHERE PRODCOST=20;
  • AND PRODCOST=20;
  • WHERE PRODCOST>=20;
  • AND PRODCOST>=20;

Question 15

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

Question 16

Question
Refer to the given SQL statement. SELECT EMPNUM FROM EMPLOYEE Which line added to the end of the statement returns employee numbers of at least 1000?
Answer
  • WHERE EMPNUM = 1000+;
  • WHERE EMPNUM > 1000;
  • WHERE EMPNUM => 1000;
  • WHERE EMPNUM >= 1000;

Question 17

Question
Refer to the given SQL statement. SELECT PRODNUM, SUM(QUANTITY) FROM SALESPERSON Which line, when added to the end of the statement, returns the total number of each kind of product by product number?
Answer
  • SUM PRODNUM;
  • COUNT PRODNUM;
  • ORDER BY PRODNUM;
  • GROUP BY PRODNUM;

Question 18

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

Question 19

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

Question 20

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 row 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 21

Question
Refer to the given SQL statement. CREATE TABLE mytbl ( f FLOAT(10,4), c CHAR(15) NOT NULL DEFAULT 'none', i TINYINT UNSIGNED NULL ); Which kind of data type is FLOAT in this statement?
Answer
  • Decimal
  • Integer
  • String
  • Data

Question 22

Question
Which two SQL data types can represent images or sounds? Choose 2 answers
Answer
  • INT
  • FLOAT
  • BINARY
  • TERNARY
  • TINYBLOB
  • SOUNDBLOB

Question 23

Question
Refer to the given SQL statement. CREATE TABLE CUSTOMER (CustomerID INT NOT NULL AUTO_INCREMENT, LastName VARCHAR(100) NOT NULL, FirstName VARCHAR(100) NOT NULL, PRIMARY KEY ( CustomerID )); Which component of the command indicates the table’s name?
Answer
  • TABLE CUSTOMER
  • CustomerID
  • CUSTOMER
  • INT

Question 24

Question
Which method creates an empty copy of a table and then populates it from the original table?
Answer
  • INSERT TABLE … SELECT followed by INSERT INTO … LIKE :
  • CREATE TABLE … LIKE followed by INSERT INTO … SELECT :
  • CREATE TABLE … INTO followed by INSERT INTO:
  • INSERT TABLE … LIKE followed by SELECT:

Question 25

Question
Refer to the given SQL syntax. ALTER TABLE tbl_name action [, action ] ... ; What does this syntax allow? Choose 2 answers
Answer
  • Adding rows
  • Dropping indexes
  • Changing storage space
  • Changing column data types

Question 26

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

Question 27

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

Question 28

Question
A database manager plans to create a view of a table and has these two elements: • The CREATE VIEW privilege for the table • A level of privilege for every column selected by the SELECT What else does the manager need to create this view?
Answer
  • The values created by the syntax INSERT INTO tbl_name VALUES(...),(...),... ;
  • The SELECT privilege for every column referred to elsewhere in the statement
  • A reciprocal level of privilege for every row selected by the SELECT statement
  • The level of privilege for every column that is part of the base table

Question 29

Question
Refer to the given SQL statement. SELECT product_name, product_number, mfg_city FROM product; Which statement, when added before this statement, generates a view?
Answer
  • VIEW viewprod:
  • ALTER viewprod AS
  • WHERE VIEW viewprod IS
  • CREATE VIEW viewprod AS

Question 30

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

Question 31

Question
Refer to the given statement. DROP VIEW EMPLOYEE; What happens as a result of the execution of this statement to the HRDB table on which the EMPLOYEE view is based?
Answer
  • The data is discarded.
  • The view is discarded.
  • The viewing of data is prohibited.
  • Unauthorized access to the view is restricted.

Question 32

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

Question 33

Question
Refer to the given information. CREATE TABLE 'test1' ( contact_id INT(10), name VARCHAR(10), event_id INT(5), Which command should be added to the end to make the event_id attribute the primary key within a CREATE TABLE statement?
Answer
  • PRIMARY KEY = event_id);
  • PRIMARY KEY (event_id));
  • (PRIMARY KEY: event_id);
  • PRIMARY (event_id)'

Question 34

Question
What does the clause PRIMARY KEY followed by a field name in parentheses mean in a CREATE TABLE statement?
Answer
  • The primary key value, in parentheses, can be used by a column.
  • The column, in parentheses, is the primary key for the table.
  • The foreign key, in parentheses, is linked to the primary key.
  • The row, in parentheses, can be inserted as the foreign key.

Question 35

Question
Which statement should be used so that it assigns a foreign key to the customer name?
Answer
  • FOREIGN KEY ( customer_name ) REFERENCES table_name ( customer_name )
  • FOREIGN KEY = customer_name REFERENCES table_name ( customer_name )
  • FOREIGN KEY ( customer_name ) ( index_columns )
  • FOREIGN KEY [ table_name ] ( customer_name )

Question 36

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

Question 37

Question
Refer to the diagram of an index table. Salesperson Table Record Address Salesperson Number Salesperson Name City Hire Date Commission Rate 1 119 Taylor, A New York 1/21/01 20% 2 137 Baker, B Detroit 2/3/11 10% 3 186 Adams, A Dallas 8/23/96 5% 4 204 Dickens, S Dallas 8/4/12 5% 5 255 Lincoln, J Atlanta 6/7/13 5% 6 361 Carlyle, L Detroit 11/11/10 7% 7 420 Green, C Tucson 9/25/12 11% 8 452 French, F New York 10/23/09 8% The database administrator has been tasked with implementing an index to speed up the retrieval of data based on the city values. The database is using the InnoDB engine. What is the correct syntax to create an index to be built on the city field based on the database information?
Answer
  • ALTER TABLE 'Salesperson' ADD INDEX 'city_index' (`city`)
  • CREATE UNIQUE INDEX city_index ON Salesperson (city);
  • CREATE INDEX city_index USING HASH ON Salesperson (city);
  • ALTER TABLE 'Salesperson' ADD UNIQUE INDEX 'city_index' (`city`)

Question 38

Question
What is the name of the special internal database where the query optimizer finds information?
Answer
  • Join catalog
  • Query catalog
  • Optimizer catalog
  • Relational catalog

Question 39

Question
Which clause in a CREATE TABLE statement creates an index on a field?
Answer
  • INDEX index_rows (index_name)
  • INDEX index_name (index_rows)
  • INDEX index_columns (index_name)
  • INDEX index_name (index_columns)

Question 40

Question
A database administrator needs to modify an index on the CUSTOMER table called IDX_NAME because there are multiple customers with the same name. It has been determined that it would be desirable to modify the index to also include the telephone number. Which command line will modify the IDX_NAME index on the CUSTOMER table to include both NAME and TELEPHONE as part of the index?
Answer
  • ALTER INDEX IDX_NAME ON CUSTOMER(NAME, TELEPHONE);
  • MODIFY INDEX IDX_NAME BY CUSTOMER(NAME, TELEPHONE);
  • CHANGE INDEX IDX_NAME BY CUSTOMER(NAME, TELEPHONE);
  • REPLACE INDEX IDX_NAME ON CUSTOMER(NAME, TELEPHONE);

Question 41

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 KEY tbl_name;
  • DROP INDEX `PRIMARY` ON tbl_name ;
  • DROP INDEX `PRIMARY KEY` ON tbl_name;
  • DROP INDEX WHERE PRIMARY KEY = tbl_name ;

Question 42

Question
A database administrator tries 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 default delete rule
  • The restrict delete rule
  • The cascade delete rule
  • The set-to-null delete rule

Question 43

Question
A manager deletes the BUILDING_MANAGEMENT row in a DEPARTMENT table. Deleting the row also deletes the GARDENING_TEAM and CLEANING_TEAM rows from the referenced PERSONNEL_TEAMS table. Which referential-integrity rule is in effect?
Answer
  • The default delete rule
  • The restrict delete rule
  • The cascade delete rule
  • The set-to-null delete rule

Question 44

Question
Refer to the given SQL statement. INSERT INTO student VALUES('John','S',NULL),('Mary','S',NULL); What do the parentheses denote?
Answer
  • The data to be duplicated
  • The attributes that are changeable
  • The row values for two individual columns
  • The column values for two individual rows

Question 45

Question
What happens in an UPDATE statement if the WHERE clause is omitted?
Answer
  • Only the first row in the table is updated.
  • Every column in the table is updated.
  • Every row in the table is updated.
  • Returns an error.

Question 46

Question
Which action deletes all rows from a table?
Answer
  • Omitting the WHERE clause from a DELETE statement
  • Adding an ALL statement to a DELETE statement
  • Omitting the table name in a DELETE statement
  • Adding an asterisk to a DELETE statement

Question 47

Question
What is the purpose of using a SELECT statement?
Answer
  • To retrieve data
  • To update data
  • To delete data
  • To index data

Question 48

Question
Which SQL statement retrieves all of the columns from the Owners table?
Answer
  • SELECT * FROM Owners;
  • SELECT ALL FROM Owners;
  • RETRIEVE COMPLETE FROM Owners;
  • RETRIEVE ALL COLUMNS FROM Owners;

Question 49

Question
Which SQL statement tallies the number of different cities in which record companies have been founded?
Answer
  • SELECT COUNT(DISTINCT city) FROM recordcompany;
  • GROUP BY *(DISTINCT city) FROM recordcompany;
  • SELECT DISTINCT city FROM recordcompany;
  • GROUP BY(city) FROM recordcompany;

Question 50

Question
Which task does ORDER BY perform by default?
Answer
  • Sorting rows in ascending order
  • Sorting rows in descending order
  • Sorting columns in ascending order
  • Sorting columns in descending order

Question 51

Question
A database administrator of a movie rental company needs to compile a list of movies released each year for a marketing campaign. Which SQL command will accomplish this?
Answer
  • SELECT MOVIE, YEAR FROM MOVIE BY TITLE;
  • SELECT MOVIE, TOTAL FROM MOVIE BY TITLE;
  • SELECT MOVIE, TITLE FROM MOVIE BY MOVIE YEAR;
  • SELECT YEAR, TITLE FROM MOVIE GROUP BY YEAR;

Question 52

Question
How does Table 2 affect the returned results from Table 1 in a left join?
Answer
  • Records are dropped from the results where a match is found between Table 1 and Table 2.
  • All Table 1 results are returned, regardless of whether a match is found in Table 2.
  • Results are only returned where a match is found between Table 1 and Table 2.
  • Table 1 results are prioritized where a match with Table 2 exists.

Question 53

Question
Which command functions as a RIGHT JOIN with the roles of the tables reversed?
Answer
  • INNER JOIN
  • OUTER JOIN
  • LEFT JOIN
  • FULL JOIN

Question 54

Question
Refer to the given SQL statement. SELECT t1.*, t2.* FROM t1 LEFT JOIN t2 ON t1.i1 = t2.i2 What does the LEFT JOIN statement do?
Answer
  • It selects the rows in Table 1 numbered the same as Table 2.
  • It selects only the rows in Table 1 that are the same as Table 2.
  • It selects all of the rows in Table 1 and the matching rows in Table 2.
  • It selects the rows in both Tables that have numerical data that is left-aligned.

Question 55

Question
What is the difference between COUNT(*) and COUNT( col_name) for specified column names?
Answer
  • COUNT(*) counts every column selected, and COUNT(col_name) counts only columns with alphabetical names.
  • COUNT(*) counts every column selected, and COUNT(col_name) counts only non-null values.
  • COUNT(*) counts every row selected, and COUNT(col_name) counts only non-null values.
  • COUNT(*) counts every row selected, and COUNT(col_name) counts every column selected.

Question 56

Question
Which function determines the total value for a column?
Answer
  • ALL()
  • SUM()
  • TOTAL()
  • SUMMARY()

Question 57

Question
How does a row subquery differ from a table subquery?
Answer
  • A row subquery returns a table with two rows in two columns.
  • A row subquery returns multiple rows of one or more values.
  • A row subquery returns a table with one row in one column.
  • A row subquery returns a single row of one or more values.

Question 58

Question
Refer to the given SQL statement. 1. SELECT SPNAME 2. FROM SALESPERSON 3. WHERE SPNUM= 4. FROM CUSTOMER 5. WHERE CUSTNUM=20900); What is missing from the subquery at the beginning of line 4?
Answer
  • (SPNUM
  • (FIND SPNUM
  • (SELECT SPNUM
  • (SUBQUERY SPNUM
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