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Galina-37 [17]
2 years ago
11

Blockquote

Computers and Technology
1 answer:
docker41 [41]2 years ago
3 0

Answer:

I don't knowthe answer

Explanation:

I really don't know the answer

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Peter Chen developed ERDs in 1976. Since then Charles Bachman and James Martin have added some slight refinements to the basic E
shusha [124]

Answer:

Check the explanation

Explanation:

In RDBMS relational database, the keys play an essential role in making the database reliable and relational in which two or more relations (tables) can be divided into a range of relations with the use of diverse types of keys due to which the redundancy decreases and flexibility of data storage increases.

The following are the usage of keys in a database:

   It helps in identifying a specific record that is present in the table.

   It is used in minimizing the redundancy from the tables.

   It is used in removing the multi-valued attributes from the relations.

   it helps in connecting one table with others by using Foreign keys.

   It is used in maintaining the uniqueness of the data stored in the database.

   It helps in identifying the relationship between two or more tables.

Types of keys in a relational database:

   PRIMARY KEY: It helps in identifying each record uniquely due to which the redundancy of data can be minimized.

   FOREIGN KEY: It is a kind of referenced key that helps in making a relationship between two or more tables. It helps in fetching records by combining two or more tables with the help of different joins.

   SUPER KEY: It is a combination of two or more keys that can be selected as primary. It may contain those columns which have repeated values.

   COMPOUND KEY: It is a combination of those columns which may not be used independently as the identification of unique records but their combination does.

   CANDIDATE KEY: It is a kind of a super key that does not contain repeated records. A primary key can be chosen from candidate keys.

8 0
3 years ago
what happened to the velocity at 30 centimeters down the ramp compared to 10 centimeters down the ramp ?
posledela

Answer:

The velocity at 30 centimeters down the ramp will be considerable higher compared to 10 centimeters down the ramp.

Explanation:

It is a non lineair problem, since the speed is increasing while rolling down the ramp.

We will expect therefore, that the graph of speed (on the y-axis) and position (on the x-axis) will NOT be a streight line.

if you could plot some values given, with speed (on the y-axis) and position (on the x-axis), then you could draw a smooth line through them, which would give an estimate of all points in between them.

What can be stated with only so limited information, is that the velocity at 30 centimeters down the ramp will be considerable higher compared to 10 centimeters down the ramp.

6 0
3 years ago
Distinguish between weighted codes and non weighted codes​
Gnom [1K]

Answer:

In weighted codes, each digit is a assigned a specific weight according to its position. NON- WEIGHTED CODE - The Non - Weighted Code are not positionally weighted. In other words, codes that are not assigned with any weight to each digit position. Hope it helpful U.

8 0
3 years ago
write a racket recursive function revert which takes a list 'l' as parameter and returns the reverse of the list. do not use bui
polet [3.4K]

have you never read he doit youtrself book?

Explanation:

4 0
2 years ago
What does the Simplify command do?
Margaret [11]
If you're talking about MATLAB, the simplify command performs an algebraic simplification within the given parameters in the parenthesis. You can use the command simplify on polynomials, expressions with trigonometric, logarithmic, and special functions. For example the following expression simplify(cos(0)) would return 1. 
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3 years ago
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