C170 - PRE-ASSESSMENT

C170 - PRE-ASSESSMENT

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?



One-to-one

One-to-many

Many-to-many

One-to-one binary - ✔✔Many-to-many



Which two examples are attributes?



Choose 2 answers



A person attending a meeting

An employee number

A sales meeting

A meeting code - ✔✔An employee number

A meeting code



Which delete rule sets column values in a child table to a missing value when the matching data is
deleted from the parent table?



Restrict

Cascade

Matching

Set-to-Null - ✔✔Set-to-Null



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



member_id

last name

suffix

expiration

email

city - ✔✔member_id

expiration



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?



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. - ✔✔Move the data from the third
column into its own table.



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?



First normal form

Second normal form

Third normal form

Fourth normal form - ✔✔Second normal form