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C170 - Practice Test
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Questions in this quiz (58)
1A 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?- AOne-to-one
- BOne-to-many
- CMany-to-many
- DOne-to-one binary
2Which kind of relationship is displayed in this entity-relationship diagram?
- AOne-to-one binary
- BOne-to-one unary
- CMany-to-many binary
- DMany-to-many unary
3Which kind of relationship is displayed in this entity-relationship diagram?
- AUnary one-to-one
- BUnary many-to-many
- CBinary one-to-one
- DBinary many-to-many
- ETernary one-to-one
- FTernary many-to-many
4How is this portion of the entity-relationship diagram read, from left to right?
- ANo books are written by an author.
- BAt least one book was written by an author.
- COne book was written by more than one author.
- DOnly one book was written by one author.
5Which two examples are attributes?
Choose 2 answers- AA person attending a meeting
- BAn employee number
- CA sales meeting
- DA meeting code
6Which delete rule sets column values in a child table to a missing value when the matching data is deleted from the parent table?
- ARestrict
- BCascade
- CMatching
- DSet-to-Null
7In 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?
- AThe delete is prohibited.
- BThe delete occurs immediately.
- CA new salesperson is assigned instead.
- DThe lack of a salesperson is flagged for later.
8Refer 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- Amember_id
- Blast name
- Csuffix
- Dexpiration
- Eemail
- Fcity
9Employee_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?- AMove the data from the third column into the first column.
- BMove the data from the third column into its own table.
- CMove the data from the first two columns into separate tables.
- DMove the data from the second column into the third column.
10A 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?- AFirst normal form
- BSecond normal form
- CThird normal form
- DFourth normal form
11Two 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?- AForeign
- BPrimary
- CCompound
- DComposite
12In 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?
- AIt is undefined.
- BIt is linked through the office ID.
- CIt is linked through the salesperson ID.
- DIt is indicated by the tables’ adjacency.
13Which command creates a database only if it does not already exist?
- AIF NOT EXISTS db_name ;
- BCREATE DATABASE IF NEW db_name ;
- CCREATE DATABASE IF NOT EXISTS db_name ;
- DIF NOT EXISTS CREATE DATABASE db_name ;
14Refer 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?- AWHERE PRODCOST=20;
- BAND PRODCOST=20;
- CWHERE PRODCOST>=20;
- DAND PRODCOST>=20;
15What does WHERE identify in a basic SQL SELECT statement?
- AThe associative entity
- BThe rows to be included
- CA table’s intersection data
- DA range of included columns
16Refer 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?- AWHERE EMPNUM = 1000+;
- BWHERE EMPNUM > 1000;
- CWHERE EMPNUM => 1000;
- DWHERE EMPNUM >= 1000;
17Refer 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?- ASUM PRODNUM;
- BCOUNT PRODNUM;
- CORDER BY PRODNUM;
- DGROUP BY PRODNUM;
18Which data definition language statement affects databases or objects in them?
- ASELECT
- BINSERT
- CALTER
- DNULL
19What does the DELETE statement do?
- AIt removes views.
- BIt removes rows from a table.
- CIt removes columns from a table.
- DIt removes columns not named in the column list.
20Which condition must be in effect to use the INSERT INTO … VALUES syntax for an INSERT statement?
- AThe VALUES list must contain a value for each non-null valued column in the table.
- BThe VALUES list must contain a value for each row in the table.
- CThe INSERT INTO portion of the statement must generate a LOAD DATA statement.
- DThe INSERT INTO portion of the statement must refer to a sampdb database table.
21Refer 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?- ADecimal
- BInteger
- CString
- DData
22Which two SQL data types can represent images or sounds?
Choose 2 answers- AINT
- BFLOAT
- CBINARY
- DTERNARY
- ETINYBLOB
- FSOUNDBLOB
23Refer 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?- ATABLE CUSTOMER
- BCustomerID
- CCUSTOMER
- DINT
24Which method creates an empty copy of a table and then populates it from the original table?
- AINSERT TABLE … SELECT followed by INSERT INTO … LIKE :
- BCREATE TABLE … LIKE followed by INSERT INTO … SELECT :
- CCREATE TABLE … INTO followed by INSERT INTO:
- DINSERT TABLE … LIKE followed by SELECT:
25
Refer to the given SQL syntax.
ALTER TABLE tbl_name action [, action ] ... ;
What does this syntax allow?
Choose 2 answers- AAdding rows
- BDropping indexes
- CChanging storage space
- DChanging column data types
26Which command eliminates a table?
- ATRUNCATE TABLE
- BDELETE TABLE
- CREMOVE TABLE
- DDROP TABLE
27Why is a view used to give controlled access to data?
- ATo add complexity to encryption techniques
- BTo move complicated security routines to subqueries
- CTo restrict access to persons retrieving and modifying sensitive information
- DTo limit many-to-many relationships between various entities and attributes
28A 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?- AThe values created by the syntax INSERT INTO tbl_name VALUES(...),(...),... ;
- BThe SELECT privilege for every column referred to elsewhere in the statement
- CA reciprocal level of privilege for every row selected by the SELECT statement
- DThe level of privilege for every column that is part of the base table
29
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?- AVIEW viewprod:
- BALTER viewprod AS
- CWHERE VIEW viewprod IS
- DCREATE VIEW viewprod AS
30What is the proper command to change a view?
- AALTER VIEW
- BCHANGE VIEW
- CMODIFY VIEW
- DUPDATE VIEW
31Refer 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?- AThe data is discarded.
- BThe view is discarded.
- CThe viewing of data is prohibited.
- DUnauthorized access to the view is restricted.
32When 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?- AForeign key constraint
- BReferential delete
- CCascaded delete
- DDynamic update
33Refer 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?- APRIMARY KEY = event_id);
- BPRIMARY KEY (event_id));
- C(PRIMARY KEY: event_id);
- DPRIMARY (event_id)'
34What does the clause PRIMARY KEY followed by a field name in parentheses mean in a CREATE TABLE statement?
- AThe primary key value, in parentheses, can be used by a column.
- BThe column, in parentheses, is the primary key for the table.
- CThe foreign key, in parentheses, is linked to the primary key.
- DThe row, in parentheses, can be inserted as the foreign key.
35Which statement should be used so that it assigns a foreign key to the customer name?
- AFOREIGN KEY ( customer_name ) REFERENCES table_name ( customer_name )
- BFOREIGN KEY = customer_name REFERENCES table_name ( customer_name )
- CFOREIGN KEY ( customer_name ) ( index_columns )
- DFOREIGN KEY [ table_name ] ( customer_name )
36Which ALTER TABLE statement adds a foreign key constraint to a child table?
- AALTER TABLE child
ADD FOREIGN KEY (par_id) REFERENCES parent (par_id) ON DELETE CASCADE; - BALTER TABLE child
ADD FOREIGN KEY (par_id) WHERE parent (par_id) ON DELETE CASCADE; - CALTER TABLE child
ADD FOREIGN KEY WHERE parent (par_id) ON DELETE CASCADE; - DALTER TABLE child
ADD FOREIGN KEY (par_id) ON DELETE CASCADE;
- AALTER TABLE child
37Refer 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?- AALTER TABLE 'Salesperson' ADD INDEX 'city_index' (`city`)
- BCREATE UNIQUE INDEX city_index ON Salesperson (city);
- CCREATE INDEX city_index USING HASH ON Salesperson (city);
- DALTER TABLE 'Salesperson' ADD UNIQUE INDEX 'city_index' (`city`)
38What is the name of the special internal database where the query optimizer finds information?
- AJoin catalog
- BQuery catalog
- COptimizer catalog
- DRelational catalog
39Which clause in a CREATE TABLE statement creates an index on a field?
- AINDEX index_rows (index_name)
- BINDEX index_name (index_rows)
- CINDEX index_columns (index_name)
- DINDEX index_name (index_columns)
40A 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?- AALTER INDEX IDX_NAME ON CUSTOMER(NAME, TELEPHONE);
- BMODIFY INDEX IDX_NAME BY CUSTOMER(NAME, TELEPHONE);
- CCHANGE INDEX IDX_NAME BY CUSTOMER(NAME, TELEPHONE);
- DREPLACE INDEX IDX_NAME ON CUSTOMER(NAME, TELEPHONE);
41Which syntax is the correct way to use the DROP INDEX command to drop a primary key from a table?
- ADROP INDEX PRIMARY KEY tbl_name;
- BDROP INDEX `PRIMARY` ON tbl_name ;
- CDROP INDEX `PRIMARY KEY` ON tbl_name;
- DDROP INDEX WHERE PRIMARY KEY = tbl_name ;
42A 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?- AThe default delete rule
- BThe restrict delete rule
- CThe cascade delete rule
- DThe set-to-null delete rule
43A 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?- AThe default delete rule
- BThe restrict delete rule
- CThe cascade delete rule
- DThe set-to-null delete rule
44Refer to the given SQL statement.
INSERT INTO student VALUES('John','S',NULL),('Mary','S',NULL);
What do the parentheses denote?- AThe data to be duplicated
- BThe attributes that are changeable
- CThe row values for two individual columns
- DThe column values for two individual rows
45What happens in an UPDATE statement if the WHERE clause is omitted?
- AOnly the first row in the table is updated.
- BEvery column in the table is updated.
- CEvery row in the table is updated.
- DReturns an error.
46Which action deletes all rows from a table?
- AOmitting the WHERE clause from a DELETE statement
- BAdding an ALL statement to a DELETE statement
- COmitting the table name in a DELETE statement
- DAdding an asterisk to a DELETE statement
47What is the purpose of using a SELECT statement?
- ATo retrieve data
- BTo update data
- CTo delete data
- DTo index data
48Which SQL statement retrieves all of the columns from the Owners table?
- ASELECT * FROM Owners;
- BSELECT ALL FROM Owners;
- CRETRIEVE COMPLETE FROM Owners;
- DRETRIEVE ALL COLUMNS FROM Owners;
49Which SQL statement tallies the number of different cities in which record companies have been founded?
- ASELECT COUNT(DISTINCT city) FROM recordcompany;
- BGROUP BY *(DISTINCT city) FROM recordcompany;
- CSELECT DISTINCT city FROM recordcompany;
- DGROUP BY(city) FROM recordcompany;
50Which task does ORDER BY perform by default?
- ASorting rows in ascending order
- BSorting rows in descending order
- CSorting columns in ascending order
- DSorting columns in descending order
51A 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?- ASELECT MOVIE, YEAR FROM MOVIE BY TITLE;
- BSELECT MOVIE, TOTAL FROM MOVIE BY TITLE;
- CSELECT MOVIE, TITLE FROM MOVIE BY MOVIE YEAR;
- DSELECT YEAR, TITLE FROM MOVIE GROUP BY YEAR;
52How does Table 2 affect the returned results from Table 1 in a left join?
- ARecords are dropped from the results where a match is found between Table 1 and Table 2.
- BAll Table 1 results are returned, regardless of whether a match is found in Table 2.
- CResults are only returned where a match is found between Table 1 and Table 2.
- DTable 1 results are prioritized where a match with Table 2 exists.
53Which command functions as a RIGHT JOIN with the roles of the tables reversed?
- AINNER JOIN
- BOUTER JOIN
- CLEFT JOIN
- DFULL JOIN
54Refer 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?- AIt selects the rows in Table 1 numbered the same as Table 2.
- BIt selects only the rows in Table 1 that are the same as Table 2.
- CIt selects all of the rows in Table 1 and the matching rows in Table 2.
- DIt selects the rows in both Tables that have numerical data that is left-aligned.
55What is the difference between COUNT(*) and COUNT( col_name) for specified column names?
- ACOUNT(*) counts every column selected, and COUNT(col_name) counts only columns with alphabetical names.
- BCOUNT(*) counts every column selected, and COUNT(col_name) counts only non-null values.
- CCOUNT(*) counts every row selected, and COUNT(col_name) counts only non-null values.
- DCOUNT(*) counts every row selected, and COUNT(col_name) counts every column selected.
56Which function determines the total value for a column?
- AALL()
- BSUM()
- CTOTAL()
- DSUMMARY()
57How does a row subquery differ from a table subquery?
- AA row subquery returns a table with two rows in two columns.
- BA row subquery returns multiple rows of one or more values.
- CA row subquery returns a table with one row in one column.
- DA row subquery returns a single row of one or more values.
58Refer 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?- A(SPNUM
- B(FIND SPNUM
- C(SELECT SPNUM
- D(SUBQUERY SPNUM
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- Description
- C170 - Database Applications
- Author
- Craig Willey
- Language
- English
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