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? Ans- Many-to-many
Which two examples are attributes?
A
...
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? Ans- Many-to-many
Which two examples are attributes?
A person attending a meeting
An employee number
A sales meeting
A meeting code Ans- 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? Ans- Set-to-Null
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? Ans- The delete is
prohibited.
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? Ansmember_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? Ans- 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? Ans- Second normal form
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? Ans- Foreign
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? Ans- Cascaded delete
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?
PRIMARY KEY = event_id);
PRIMARY KEY (event_id));
(PRIMARY KEY: event_id);
PRIMARY (event_id)' Ans- PRIMARY KEY (event_id));
What does the clause PRIMARY KEY followed by a field name in parentheses mean in a CREATE TABLE
statement? Ans- The column, in parentheses, is the primary key for the table.
Which statement should be used so that it assigns a foreign key to the customer name? Ans- FOREIGN
KEY ( customer_name ) REFERENCES table_name ( customer_name )
Which command creates a database only if it does not already exist? Ans- CREATE DATABASE IF NOT
EXISTS db_name ;
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? Ans- WHERE PRODCOST=20;
What does WHERE identify in a basic SQL SELECT statement? Ans- The rows to be included
Refer to the given SQL statement.
SELECT EMPNUM
FROM EMPLOYEE
[Show More]
.png)
.png)
