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3 years ago

The Role of Computer

Computers and Technology

1 answer:

prisoha [69]3 years ago

3 0

Answer:

The performance of a computer system is dependent on the hardware components and the type of applications running on the system.

Explanation:

Computer systems are only as efficient as the components. If the components are poor in performance, the computer system works poorly and it is so for good system components.

Adding multi-core, multi-threading system processor and a faster storage like the solid state drive, and upgrading other hardware components based on the applications that needs to run in the system, the computer works efficiently and fast.

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Write the SQL statements that define the relational schema (tables)for this database. Assume that person_id, play_id, birth_year

Sunny_sXe [5.5K]

Answer:

SQL statement that defines table for Actor

CREATE TABLE Actor(

person_id integer primary key,

name varchar2(40) not null,

birth_year integer check ((birth_year) <= 2019)

);

SQL statement that defines table for Play

CREATE TABLE Play(

play_id integer primary key,

title varchar2(60) not null,

author varchar2(60) not null,

year_written integer check ((year_written) <= 2019)

);

SQL statement that defines table for Role

CREATE TABLE Role (

person_id integer,

character_name varchar2(60) not null,

play_id integer,

constraint fk_person foreign key (person_id) references actor(person_id),

constraint fk_play foreign key (play_id) references play(play_id),

primary key (person_id, character_name, play_id)

);

Explanation:

Other information that were not added to the question are as below:

The following database contains information about three tables i.e. actors, plays, and roles they performed.

Actor (person_id, name, birth_year)

Play (play_id, title, author, year_written)

Role (person_id, character_name, play_id)

Where: Actor is a table of actors, their names, and the year they were born. Each actor has a unique person_id, which is a key.

Play is a table of plays, giving the title, author, and year written for each play. Each play has a unique play_id, which is a key.

Role records which actors have performed which roles (characters) in which plays.

Attributes person_id and play_id are foreign keys to Actor and Play respectively.

All three attributes make up the key since it is possible for a single actor to play more than one character in the same play

Further Explanation:

In SQL, in order to define relational schema (Tables) for a database, we use CREATE TABLE statement to create a new table in a database. The column parameters specify the names of the columns of the table. The datatype parameter specifies the type of data the column can hold (varchar, integer, date)

4 0

3 years ago

Write a program FindDuplicate.java that reads n integer arguments from the command line into an integer array of length n, where

kozerog [31]

Answer:

public class FindDuplicate{
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
int n = 5;
int arr[] = new int[n];
for(int i=0; i < arr.length; i++){
int inputNum = input.nextInt();
if(inputNum >=1 && inputNum <=n) {
arr[i] = inputNum;
}
}
for(int j =0; j < arr.length; j++){
for(int k = 0; k < arr.length; k++){
if(j == k){
continue;
}else{
if(arr[j] == arr[k]){
System.out.println("True");
return;
}
}
}
}
System.out.println("False");
}
}

Explanation:

Firstly, create a Scanner object to get user input (Line 4).

Next, create an array with n-size (Line 7) and then create a for-loop to get user repeatedly enter an integer and assign the input value to the array (Line 9 - 14).

Next, create a double layer for-loop to check the each element in the array against the other elements to see if there is any duplication detected and display "True" (Line 21 - 22). If duplication is found the program will display True and terminate the whole program using return (Line 23). The condition set in Line 18 is to ensure the comparison is not between the same element.

If all the elements in the array are unique the if block (Line 21 - 23) won't run and it will proceed to Line 28 to display message "False".

7 0

3 years ago

In the context of computer crimes, those who attempt to destroy the infrastructure components of governments and financial insti

elixir [45]

In the context of computer crimes, those who attempt to destroy the infrastructure components of governments and financial institutions are known as d. cyber terrorists.

Explanation:

Cyber crime means crime committed with the help of computer and internet. Cyber terrorism means crime that causes damage to infrastructure components of financial institutions and government office and causes threat to the society.

Cyber terrorists are person who involve in cyber terrorism. The systems used in the governments and financial institutions should be protected with hardware and software to avoid cyber terrorism.

This kind of cyber terrorism is very dangerous, as they hack the system and destroy the valuable information stored in it.

5 0

3 years ago

Cars are only as safe as their driver, so __ is your bet to lower your risk.

lara [203]

seatbelt

Explanation:

Seatbelt lowers your momentum so it can take impact to be less dangerous

7 0

3 years ago

The directory "a" contains its subdirectory "b" and there is no other entry in the directory "a". You want to display "the conte

Svet_ta [14]

The answer assumes that the question is about which command help accomplish display directory contents in Unix-like operating systems.

Answer:

The command is ls.

Explanation:

The command ls (short for list) displays a variety of important information in different ways regarding any directory contents. Because of this, it is probably one of the most used commands in Unix-like operating systems.

Any directory can contain directories and files of different sizes, recently created/modified, attributes like permissions for being accessed, and, with this command, we can see all this information by size, chronologically, by owner, and/or by many more ways.

In the question, we can accomplish to list that the directory "a" contains its sub-directory "b" and no other entry using the next line of code:

Command-line 1: $\\ ls\; a$ (the command "says": display content of a)

Result: $b$

The result is only the directory b because there is no other entry in it.

To display more information regarding b, we can use the many options available for the command ls, like -a (all entries), -d (only directories), -l (long listing format), and so on, e.g. ls -a A (display all entries in directory A, included hidden files).

6 0

3 years ago