Question

1Каждой оценке поставили в соответствие ученика, который её получил, и получили функциональную зависимость. 2Если поставить в соответствие ребру куба его объём, то получим не функциональную зависимость. 3Если поставить в соответствие величине заработной платы работника, её получающего, то получим функциональную зависимость. 4В прямоугольном треугольнике рассмотрели зависимость одного острого угла от другого и решили, что она не функциональная. 5На концерт известной рок-группы продаются билеты в элитные ложи на 10 человек. Условия продажи таковы: приобретается один билет на 10 человек, то есть на всех людей в ложе. Если поставить каждому купленному билету человека, в ней оказавшегося, то имеем дело с функциональной зависимостью.

Answer 1

Ответ:

форма куба бедет соответствии каждому функционированиенный машине

Answer 2

Functional and Non-functional Dependencies

In mathematics and computer science, a functional dependency is a relationship between two sets of attributes in a database. It describes how the values of one set of attributes determine the values of another set of attributes. If every possible combination of values in one set of attributes corresponds to exactly one combination of values in the other set, then the dependency is considered functional.

On the other hand, a non-functional dependency is a relationship between attributes where the values of one set of attributes do not uniquely determine the values of another set. In other words, there can be multiple combinations of values in one set that correspond to the same combination of values in the other set.

Let's examine the examples provided to understand the concept of functional and non-functional dependencies.

Example 1: Grades and Students

In this example, each grade is associated with a student who received it. This creates a functional dependency because each grade corresponds to a unique student. Therefore, we can say that there is a functional dependency between the grades and the students who received them.

Example 2: Cube Volume

If we associate the volume of a cube with its edge length, we do not have a functional dependency. This is because multiple cubes can have the same volume but different edge lengths. Therefore, the relationship between the volume and the edge length of a cube is a non-functional dependency.

Example 3: Salary and Employee

When we associate the salary of an employee with the employee receiving it, we have a functional dependency. Each employee has a unique salary, so there is a one-to-one correspondence between the salary and the employee. Therefore, the relationship between the salary and the employee is a functional dependency.

Example 4: Angles in a Right Triangle

In a right triangle, if we consider the relationship between one acute angle and the other, we have a non-functional dependency. This is because multiple combinations of acute angles can result in the same relationship between them. Therefore, the relationship between the angles in a right triangle is a non-functional dependency.

Example 5: Concert Tickets

In the case of selling tickets for a concert in elite boxes, where one ticket is valid for 10 people, there is a functional dependency. Each ticket corresponds to a specific group of 10 people who will occupy the box. Therefore, the relationship between the ticket and the people in the box is a functional dependency.

Please note that the examples provided are for illustrative purposes and may not cover all possible scenarios. The concept of functional and non-functional dependencies is widely used in database design and normalization to ensure data integrity and eliminate redundancy.

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