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Bezzdna [24]
3 years ago
14

True or False? Popular sites are always mean accurate.

Computers and Technology
2 answers:
Eduardwww [97]3 years ago
6 0
Popular sites are not always accurate. false
iris [78.8K]3 years ago
6 0

Answer:

false

Explanation:

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- Consider the relation R = {A, B, C, D, E, F, G, H, I, J} and the set of functional dependencies F = { {B, C} -> {D}, {B} -&
Olenka [21]

Answer:

The key of R is {A, B}

Explanation:

A key can be seen as a minimal set of attributes whose closure includes all the attributes in R.

Given that the closure of {A, B}, {A, B}+ = R, one key of R is {A, B} But in this case, it is the only key.

In order for us to to normalize R intuitively into 2NF then 3NF, we have to make use of these approaches;

First thing we do is to identify partial dependencies that violate 2NF. These are attributes that are

functionally dependent on either parts of the key, {A} or {B}, alone.

We can calculate

the closures {A}+ and {B}+ to determine partially dependent attributes:

{A}+ = {A, D, E, I, J}. Hence {A} -> {D, E, I, J} ({A} -> {A} is a trivial dependency)

{B}+ = {B, F, G, H}, hence {A} -> {F, G, H} ({B} -> {B} is a trivial dependency)

To normalize into 2NF, we remove the attributes that are functionally dependent on

part of the key (A or B) from R and place them in separate relations R1 and R2,

along with the part of the key they depend on (A or B), which are copied into each of

these relations but also remains in the original relation, which we call R3 below:

R1 = {A, D, E, I, J}, R2 = {B, F, G, H}, R3 = {A, B, C}

The new keys for R1, R2, R3 are underlined. Next, we look for transitive

dependencies in R1, R2, R3. The relation R1 has the transitive dependency {A} ->

{D} -> {I, J}, so we remove the transitively dependent attributes {I, J} from R1 into a

relation R11 and copy the attribute D they are dependent on into R11. The remaining

attributes are kept in a relation R12. Hence, R1 is decomposed into R11 and R12 as

follows: R11 = {D, I, J}, R12 = {A, D, E} The relation R2 is similarly decomposed into R21 and R22 based on the transitive

dependency {B} -> {F} -> {G, H}:

R2 = {F, G, H}, R2 = {B, F}

The final set of relations in 3NF are {R11, R12, R21, R22, R3}

4 0
3 years ago
Complete each sentence using the drop-down menu. Information on local driving laws can be found on a website. A class textbook c
zheka24 [161]

Answers:

1. D

2. A

3. B

4. C

Explanation: I just did it and got a 100%

7 0
3 years ago
Read 2 more answers
What types of storage can be used to access your data on another computer?
Ivenika [448]
<span>You could use cloud storage. Basically, the things you save are actually saved on another computer, that is, on another server, that is used as a hard drive for many pcs. You can access the cloud storage if you have internet and it works like a normal hard drive. There are even laptops that don't have storage other than cloud storage.</span>
6 0
3 years ago
A network administrator was told by the Chief Information Officer (CIO) to set up a new office with a network that has redundanc
balandron [24]

Answer:

"Mesh topology" is the correct answer.

Explanation:

  • A mesh topology seems to be a network configuration where there has been an interconnection between each hardware and communications system. This topology configuration allows the distribution of many of these signals, although one of the connexons starts going down.
  • This topology needs to connect each destination to any other end destination, thus creating a completely pointless channel.
3 0
3 years ago
giving Brianlist (to the correct answers)help plesee question is what is keyboard (long paragraph)​plzz don't spam with unnecess
Ira Lisetskai [31]

Answer:

Explanation:

A computer keyboard is an input device that allows a person to enter letters, numbers, and other symbols (these are called characters in a keyboard) into a computer. Using a keyboard to enter lots of data is called typing. A keyboard contains many mechanical switches or push-buttons called "keys".

7 0
3 years ago
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