Type of relationship, degree, power, uncertainty

Question

I am currently studying a database in which I have seen the degree and power used as one and the same term, or in some other degree is defined as not. organizations involved in relationships and subsequent varieties, such as unary, binary, etc.

A certain degree is defined as the degree of the type of relationship to the number of entities within each type of entity that can be associated with this type of relationship.

Minimum and maximum number of entities associated with a single occurrence related object

as 1 to 1 , 1 to many , many to many . or minimum and maximum power.

The minimum degree is optional, and the maximum degree is cardinality.

What is the difference between degree and cardinality?

In another context, power is the number of rows in the table, and degree is the number of columns.

So, what should I write if the question "Determine power?" Is asked.

Can someone explain?

Answer 1

Ok here is the explanation

1.Degree. This is the number of entities involved in the relationship, and usually it is 2 (binary relations), however, unary and higher degrees may exist.

2.Cardinality. This indicates the amount of each object that is involved in the ratio. There are 3 types of power for binary relations.

• one to one (1: 1)
• one to many (1: n)
• many to many (n: m)

hope this clears your mind. Please contact for more information.

Answer 2

To add to the first answer: Just

The degree of the relationship is the number of attributes in the ratio. The ratio of the relationship is the number of tuples in the ratio.

It is not possible to post an image to show you, but you can check out this book to find out more and get a better picture. There is also Connolly and Begg - Database Systems, 4th Edition Link:

Elmasri, R., Navathe, SB, 2011. Fundamentals of database systems. 6th ed. United States: Pearson.

Answer 3

Degree of relationship: the number of entities involved in the relationship. It can be unary, binary, triple, quaternary, etc.

Power: the number of instances of relationships in which the subject can participate. Example: 1: 1, 1: Many, many: N

(Min., Max.) Notation: Minimum represents participation restrictions, while Maximum represents power factor.

The degree of relationship: the number of columns (attributes) in the relationship (table).

Answer 4

Degree - number of attributes in relation (table)

Cardinality - the number of tuples (rows) present in the table

See this for more details.