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Sergio [31]
3 years ago
14

An array of 100 elements is to be

Computers and Technology
1 answer:
LekaFEV [45]3 years ago
3 0

Answer:

It will always return (completely sorted) after 99 data comparisons.

It will always require at least 99 comparisons

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
Machine language library routines are installed on computers Select one: a. because they can come as part of the operating syste
Licemer1 [7]

Answer:

c. all of these choices

Explanation:

all of them are correct. i took a quiz on this like 2 days ago and that was the answer.

<em>hope this helpsssssssss!!!!!!!!!!! :):):)</em>

6 0
3 years ago
5. The best way to clear your Reader is to
Fantom [35]

Answer:

Mark all posts as read

Explanation:

I've did it before

7 0
3 years ago
Read 2 more answers
How do mutations affect natural selection? brain pop
Cerrena [4.2K]

Answer:

please give me brainlist and follow

Explanation:

Genetic variations that alter gene activity or protein function can introduce different traits in an organism. If a trait is advantageous and helps the individual survive and reproduce, the genetic variation is more likely to be passed to the next generation (a process known as natural selection).

3 0
3 years ago
Steve is happy today but he ____ yesterday​
suter [353]

steve is happy today but he wasn't yesterday

3 0
2 years ago
Read 2 more answers
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