1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
kotykmax [81]
3 years ago
6

Which speaker port should you use when connecting a single speaker to a pc?

Computers and Technology
1 answer:
natima [27]3 years ago
5 0
The auxiliary port I think
You might be interested in
[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 }..

2.

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

3.

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.

6 0
3 years ago
Which is an effect of short-term environmental changes?
allochka39001 [22]
Adaptation or death






.
4 0
2 years ago
What shortcut keys do i use to print something on my keyboard ?
romanna [79]
CTRL+P. It's usually pressed when you want to print something.
5 0
2 years ago
Read 2 more answers
Any mobile devices contain a(n) ___ and gyroscope that can sense even the smallest movements.
mars1129 [50]

Any mobile device contains a(n) accelerometer and gyroscope that can sense even the smallest movements.

<h3>What are accelerometers? What does an accelerometer sensor do in mobile phones?</h3>

The orientation of a mobile phone is determined by the accelerometer in the device. The gyroscope, or gyro for short, tracks rotation or twist to provide another dimension to the data provided by the accelerometer.

A smartphone's built-in accelerometer measures the device's acceleration. It tracks the different motions like shaking, tilting, swinging, and rotating and accordingly changes the orientation of your app. The accelerometer utilizes the value of XYZ to determine and detect motion.

To know more about accelerometer , Visit:

<u>brainly.com/question/27960990</u>

#SPJ4

7 0
1 year ago
Where are parameters such boot order, processor voltage, motherboard raid, hardware virtualization support, and overclocking con
ololo11 [35]

This is configured on the BIOS Setup. During computer start-up usually for windows system this can be accessed via pressing on ESC or Function keys on immediate start up.

6 0
2 years ago
Other questions:
  • Jackie is planning a birthday party for her little brother and is researching different trampoline parks. She receives a pop-up
    12·2 answers
  • Mica's creating his web page with a software that is free of charge for the first month. If he likes the program, he will have t
    8·2 answers
  • What natural resource are available on the coast but not somewhereelse
    13·1 answer
  • It is not important to keep financial records since they can all be found online.
    5·2 answers
  • Mkdir() is the command in Java to create a new directory.<br> a) True b) False
    10·1 answer
  • PLEASE HELP <br> Which of the following best describes the existence of undecidable problems?
    7·1 answer
  • Estoy empezando a usar una pagina llamada source filmmaker, no se que apreté y quiero el menú de nuevo (en donde se ponen los mo
    14·1 answer
  • What is the purpose of extent in lines in engineering drawing
    12·1 answer
  • PYTHON
    5·1 answer
  • which filename refers to a 16-bit real-mode program that queries the system for device and configuration data, and then passes i
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!