Database Fundamentals exam Flashcards
You need to store product quantities, and you want to minimise the amount of storage space that is used. Which data type should you use?
Integer
Which Statement will result in the creation of an index?
CREATE TABLE Employee
EmployeeID INTEGER PRIMARY KEY
You need to store product names that vary from three to 30 characters, while minimising the storage spaced used. Which data type should you use?
VARCHAR(30)
One reason to create a stored procedure is to?
Improve performance
Which permission does a user need in order to run a stored procedure?
EXECUTE
In SQL, an insert statement is used to add a:
Row of data to a table
You have two tables. Each table has three rows. How many rows will be included in the Cartesian product of these two tables?
9
You are writing an SQL statement to retrieve rows from a table. Which data manipulation language(DML) command can you use?
SELECT
Which constraint ensures a unique value in the ID column for each user?
PRIMARY KEY
The component that holds information for a single entry in a table is called a:
Row
Which keyword would you use in a select statement to return tows that meet a specific condition?
WHERE
What command should you use to remove a table from a database?
DROP TABLE
You need to store contact information for each student in your school database. You should store each student’s information in a:
Row
Which category of SQL statements is used to add, remove, and modify database structures?
Data definition language (DDL)
Data is a database is stored in:
Tables
Denormalization is performed in order to:
Improve query performance
How do you make a search by unique ID more efficient?
An index
Which two keys establish a relationship between two tables?
Foreign and Primary
One difference between a function and a stored procedure is that a function:
Must return a value
Which keyword must be included in a create view statement?
SELECT
You need to remove a view named EmployeeView from your database Which statement should you use?
DROP VIEW EmployeeView
A named group of SQL statements that can be executed in a database is called a:
Stored procedure
A view can be used to:
Limit access to specific rows or columns of data in a database
On which database structure does an update statement operate?
Table
You delete rows in a table named Order. The corresponding row in the OrderItem table are automatically deleted. This process is an example of a/an:
Cascade delete
What defines the amount of storage space that is allocated to a value in a column?
Data type
You are creating a table to store customer data. The AccountNumber column uses values that always consist of one letter and four digits. Which data type should you use for the AccountNumber column?
CHAR
What is one difference between an update statement and a delete statement?
An update statement does not remove rows from a table
You have a Department table and an Employee table in your database.
You need to ensure that an employee can be assigned to only an existing department. What should you apply to the Employee table?
A foreign key
You need to store the first name, last name, and student ID for 100 students. This information will be stored as a:
100 rows and three columns
What are three valid data manipulation language commands?
INSERT, DELETE, UPDATE
First normal form requires that a database excludes
Repeating groups
You need to combine the results of two queries into a single result that contains all of the rows from both queries. Which Structured Query Language (SQL) statement should you use?
UNION
You accept an IT internship at a local charity. The charity wants you to help them with compliance and auditing requirements. You need to ensure that a column or combination of columns uniquely identifies each row of a table.
Which constraint should you define?
Foreign Key
While attending college, you accept an IT internship at a local charity. The charity needs to report on data that is related and exists in two tables. You need to establish a relationship between the data that is in the two tables.
Which constraint should you define?
Index key
You need to rename a column in a database table.
Which data definition language (DDL) statement should you use?
ALTER
You need to delete a database table.
Which data definition language (DDL) keyword should you use?
DROP
In which situation do you need to perform a restore on a database?
When data becomes corrupted in the database
Which command should you use to give a user permission to read the data in a table?
GRANT SELECT
You need to enable a new employee to authenticate to your database. Which command should you use?
CREATE USER
Which permission does a user need in order to run a stored procedure?
EXECUTE
You have a table named Product. You create a view that includes all the products from the Product table that are in the Furniture category. You execute a statement on the Product table that deletes all the products in the Furniture category.
After you execute the statement, the result set of the view is:
Empty
In SQL, an insert statement is used to add a:
Row of data to a table
You have two tables. Each table has three rows.
How many rows will be included in the Cartesian product of these two tables?
9
Which command should you use to add a column to an existing table?
ALTER
You are writing a select statement to find every product whose name contains a specific character. Which keyword should you use in your where clause?
LIKE
A database contains two tables named Customer and Order. You execute the following statement:
DELETE FROM Order WHERE CustomerID = 209
What is the result?
All order for CustomerID 209 are deleted from the Order table
Which keyword would you use in a select statement to return rows that meet a specific condition?
WHERE
Which database term is used to describe the process of applying a backup to a damaged or corrupt database?
Restore
You have a table named Employee that includes four columns. You execute the following statement:
SELECT * FROM Employee
Which columns are returned?
All columns
Which two elements are required to define a column? (Choose two.)
A name and a data type
What is one difference between an update statement and a delete statement?
An update statement does not remove rows from a table
You have a Department table and an Employee table in your database.
You need to ensure that an employee can be assigned to only an existing department. What should you apply to the Employee table?
A foreign key
You assign User1 a set of permissions that include the WITH GRANT OPTION. The WITH GRANT OPTION enables User1 to:
create new database users
Which type of index changes the order in which the data is stored in a table?
Non-sequential
Which statement should you use to remove a foreign key?
ALTER TABLE
You execute a statement inside a transaction to delete 100 rows from a table. The transaction fails after only 40 rows are deleted. What is the result in the database?
No rows will be deleted from the table
You have two tables named Salesperson and Sales.
You need to ensure that each record in the Sales table has a valid associated salesperson record in the Salesperson table. Which database object should you add to the Sales table?
Primary Key
The terms bitmap, b-tree and hash refer to which type of database structure?
Index
One reason to add an index is to:
Improve performance of select statements
You execute the following statement:
SELECT EmployeeID, FirstName, DepartmentName FROM Employee, Department
This type of operation is called a/an:
Cartesian product
You have a Customer table and an Order table. You join the Customer table with the Order table by using the CusromerID column.
The results include:
All customers and their orders Customers who have no orders.
Which type of join do these results represent?
Outer join
You need to establish a set of permissions that you can routinely sign to new users. What should you create?
Role
You need to disable User1’s access to view the data in the Customer table. Which statement should you use?
REVOKE SELECT ON Customer
FROM User1
You have a table named Product that contains one million rows.
You need to search for product information in the Product table by using the product’s unique ID. What will make this type of search more efficient?
An index
You have a table named Customer. You need to add a new column named District. Which statement should you use?
ALTER TABLE Customer ADD
District INTEGER
You need to list the name and price of each product, sorted by price from highest to lowest. Which statement should you use?
SELECT Name, Price
FROM Product
ORDER BY Price DESC
You have a table of products with fields for ProductID, Name, and Price.
You need to write an UPDATE statement that sets the value in the InStock field to Yes for a specific ProductID. Which clause should you use in your update statement?
WHERE
This question requires that you evaluate the underlined text to determine if it is correct. Use [indexing] to create, remove, or change database objects.
Data Definition Language (DDL) statements
You need to add rows to a database table. Which SQL keyword should you use?
JOIN
This question requires that you evaluate the underlined text to determine if it is correct.
The [UNION] keyword combines the results of two queries and returns only rows that appear in both result sets.
INTERSECT
This question requires that you evaluate the underlined text to determine if it is correct.
You combine data from three tables into one table. The new table includes redundancy to optimize read performance.
The data in the new table has been [denormalized].
No change is needed
This question requires that you evaluate the underlined text to determine if it is correct.
[Truncate] is a database term used to describe the process of applying a backup to a damaged or corrupt database.
Restore
QUESTION 72
This question requires that you evaluate the underlined text to determine if it is correct. Use the [ALLOW SELECT] command to give a user permission to read the data in a table.
GRANT SELECT
You accept an IT internship at a local charity. The charity asks you to keep a record of its volunteers by using a database table named Volunteer. When volunteers ask to be removed from mailing lists, the table must be updated.
You need to use a transaction to ensure that the database has data integrity and referential integrity.
Which statement should you use?
BEGIN TRANSACTION VolunteerDelete;
DELETE FROM Volunteer WHERE Id = 13;
COMMIT TRANSACTION VolunteerDelete;
Ports [20 and 21] are the default ports to secure a SQL Server.
1433 and 1434
You have the following SQL query:
SELECT * FROM dbo.ProAthlete
WHERE Salary > 500000
The query takes too much time to return data.
You need to improve the performance of the query.
Which item should you add to the Salary column?
Foreign key
You have a table that contains information about all students in your school.
You use the [INSERT] SQL keyword to change a student’s given name in the table.
UPDATE
