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4 years ago

1.a. EXPLAIN THE TERM LOGGING INTO A EMAIL ACCOUNT

Computers and Technology

1 answer:

liubo4ka [24]4 years ago

4 0

Answer:

The answer to this question is given below in the explanation section.

Explanation:

Logging into an email account:

Logging into email account, that you are trying to login to your email account.

For example, if you want to login to g-mail , you give your user name and password, upon correct user name and password, the email management system will then allow you to login to your account, where you can see your inbox, outbox, and other customized emails.

WRITE DOWN THE STEPS TO LOG IN AN EMAIL ACCOUNT

The following steps are used to log in an email account:

Enter your email account URL in your browser or open the application of email. For example g-mail.
Then enter your username and password
Upon provision of right username and password, email system will direct you to login to your email account.

EXPLAIN THE TERM LOGGING OUT AN EMAIL ACCOUNT

The term logging out from an email account means that you are leaving your email account, and the email management system will ensure that no one tries to access your system and protect it from others. It is same like as you are protecting your files and folders and important data from other users in your system while setting login and logout password.

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Who is considered as the father of computer science

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Answer:

Turing is considered as the father of computer science

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3 years ago

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Which of the following is a form of security protection that protects individual files by scrambling the contents in such a way

Alla [95]

Answer: C. File encryption

Explanation: To ensure security and privacy of files and its content, encrypting the file may be an option. File encryption refers to a process of ensuring the security and privacy of individual files so as to prevent unauthorized access to the content. File encryption works by setting up a security key which will be requested or needed when the file is being clicked such that only users or individuals with the authorized pass code or password can open and read its content or modify the file, this is called file decryption.

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3 years ago

Create a stored procedure sp_Q1 that takes two country names like 'Japan' or 'USA' as two inputs and returns two independent set

wolverine [178]

Answer:

Kindly note that, you're to replace "at" with shift 2 as the brainly text editor can't take the symbol

If you are executing this script with any other script, Add "GO" to the line above "CREATE PROCEDURE", on a line all by itself, and it should fix that error of 'CREATE/ALTER PROCEDURE'

Explanation:

CREATE PROCEDURE sp_Q1

"at"country1 NVARCHAR(15),

"at"country2 NVARCHAR(15)

BEGIN

SELECT SupplierID, CompanyName, Phone, Country FROM suppliers

where Country in ("at"country1,"at"country2)

SELECT ProductID, ProductName, UnitPrice, SupplierID FROM Products

where SupplierID in(

SELECT SupplierID FROM suppliers

where Country in ("at"country1,"at"country2)) ORDER BY SupplierID

END

-- Testing script.

DECLARE "at"RC int

DECLARE "at"country1 nvarchar(15)

DECLARE "at"country2 nvarchar(15)

-- Set parameter values here.

set "at"country1='UK'

set "at"country2='Canada'

EXECUTE "at"RC = [dbo].[sp_Q1]

"at"country1

,"at"country2

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3 years ago

[1] Please find all the candidate keys and the primary key (or composite primary key) Candidate Key: _______________________ Pri

AVprozaik [17]

Answer:

Check the explanation

Explanation:

1. The atomic attributes can't be a primary key because the values in the respective attributes should be unique.

So, the size of the primary key should be more than one.

In order to find the candidate key, let the functional dependencies be obtained.

The functional dependencies are :

Emp_ID -> Name, DeptID, Marketing, Salary

Name -> Emp_ID

DeptID -> Emp_ID

Marketing -> Emp_ID

Course_ID -> Course Name

Course_Name -> Course_ID

Date_Completed -> Course_Name

Closure of attribute { Emp_ID, Date_Completed } is { Emp_ID, Date_Completed , Name, DeptID, Marketing, Salary, Course_Name, Course_ID}

Closure of attribute { Name , Date_Completed } is { Name, Date_Completed , Emp_ID , DeptID, Marketing, Salary, Course_Name, Course_ID}

Closure of attribute { DeptID, Date_Completed } is { DeptID, Date_Completed , Emp_ID,, Name, , Marketing, Salary, Course_Name, Course_ID}

Closure of attribute { Marketing, Date_Completed } is { Marketing, Date_Completed , Emp_ID,, Name, DeptID , Salary, Course_Name, Course_ID}.

So, the candidate keys are :

{ Emp_ID, Date_Completed }

{ Name , Date_Completed }

{ DeptID, Date_Completed }

{ Marketing, Date_Completed }

Only one candidate key can be a primary key.

So, the primary key chosen be { Emp_ID, Date_Completed }..

The functional dependencies are :

Emp_ID -> Name, DeptID, Marketing, Salary

Name -> Emp_ID

DeptID -> Emp_ID

Marketing -> Emp_ID

Course_ID -> Course Name

Course_Name -> Course_ID

Date_Completed -> Course_Name

For a relation to be in 2NF, there should be no partial dependencies in the set of functional dependencies.

The first F.D. is

Emp_ID -> Name, DeptID, Marketing, Salary

Here, Emp_ID -> Salary ( decomposition rule ). So, a prime key determining a non-prime key is a partial dependency.

So, a separate table should be made for Emp_ID -> Salary.

The tables are R1(Emp_ID, Name, DeptID, Marketing, Course_ID, Course_Name, Date_Completed)

and R2( Emp_ID , Salary)

The following dependencies violate partial dependency as a prime attribute -> prime attribute :

Name -> Emp_ID

DeptID -> Emp_ID

Marketing -> Emp_ID

The following dependencies violate partial dependency as a non-prime attribute -> non-prime attribute :

Course_ID -> Course Name

Course_Name -> Course_ID

So, no separate tables should be made.

The functional dependency Date_Completed -> Course_Name has a partial dependency as a prime attribute determines a non-prime attribute.

So, a separate table is made.

The final relational schemas that follows 2NF are :

R1(Emp_ID, Name, DeptID, Marketing, Course_ID, Course_Name, Date_Completed)

R2( Emp_ID , Salary)

R3 (Date_Completed, Course_Name, Course_ID)

For a relation to be in 3NF, the functional dependencies should not have any transitive dependencies.

The functional dependencies in R1(Emp_ID, Name, DeptID, Marketing, Date_Completed) is :

Emp_ID -> Name, DeptID, Marketing

This violates the transitive property. So, no table is created.

The functional dependencies in R2 ( Emp_ID , Salary) is :

Emp_ID -> Salary

The functional dependencies in R3 (Date_Completed, Course_Name, Course_ID) are :

Date_Completed -> Course_Name

Course_Name -> Course_ID

Here there is a transitive dependency as a non- prime attribute ( Course_Name ) is determining a non-attribute ( Course_ID ).

So, a separate table is made with the concerned attributes.

The relational schemas which support 3NF re :

R1(Emp_ID, Name, DeptID, Course_ID, Marketing, Date_Completed) with candidate key as Emp_ID.

R2 ( Emp_ID , Salary) with candidate key Emp_ID.

R3 (Date_Completed, Course_Name ) with candidate key Date_Completed.

R4 ( Course_Name, Course_ID ). with candidate keys Course_Name and Course_ID.

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3 years ago

Find time complexity

grigory [225]

A b c is the complex

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3 years ago