what is binary relationship? explain with example - Computer science fundamentals tutorial

Cardinality/Binary relationship

Cardinality/Binary relationship defines the numerical attributes of the relationship between two entities or entity sets.
Types of Cardinality/ Binary relationship
Cardinality/ Binary relationship are four types. now discuss all types of Binary relation ship.

One to one relationship : -

When a single instance of an entity is associated with a single instance of another entity then it is called one to one relationship.

For example : - a person has only one passport and a passport is given to one person.

One to many relationship : -

When a single instance of an entity is associated with more than one instance of another entity then it is called one to many relationship.

For example: -

One customer can placed many orders but an order can’t be placed by many customers.

Many to One relationship: -

When more than one instance of an entity is associated with single instance of another entity then it is called many to one relationship.

For example: -

Many students can study in a single college but a student in many colleges at same time.

Many to many relationship: -

When more than one instance is associated with more than instance of another entity then it is called many to many relationship.

For example: -

More than one employee assigned to many project and many project can be assigned to many employee.

Comments

type casting in C. - computer science fundamentals tutorial

Typecasting in C Typecasting is also known as "forced conversion". It refers to changing variable one data type to another data type. Typecasting in can be certified into following two types: - 1) Implicit type casting. 2) Explicit type casting. Implicit type casting : - It is also known as "Automatic type conversion". It is done by compiler on its own without any external trigger from user. Generally takes place when in an expression more than one data type is present in such condition. Type conversion take places to avoid data lose. Example : - #include<stdio.h> main() { char y = 'a'; int b = y; printf("%c",y); printf("%d",b); } Explicit Type casting : - This process also called 'Type casting' and it is user defined . Here the user can type cast the result to make it of particular data type. Example : - #include<stdio.h> main() { int m

Important MCQ of RDBMS( Relational database management system)-FCST

Important MCQ of RDBMS 1. A RDBMS consists a collection of ? a. Tables b. Fields c. Records d. Keys ANS/- a. table 2. The term attribute refers to a ___________ of a table a. Record b. Tuple c. Column d. Key ans/- c. Column 3. In relational model, the row of table is known to be ? a. Relation b. Entity field c. Tuple d. Attribute ans/- C. Tuple 4. . Address field of a person should not be part of primary key, since it is likely to ? a. Dependent b. Too long c. Changed d. Not changed ans/- c. Changed 5. The relational model is concerned with ? a. Data structure and Data integrity b. Data Manipulation c. Both a and b d. None of these ans/- c. Both a and b 6. Which is the false statement from the following ? a. A veiw is a named derived table b. A name relation is variable c. A veiw is a named reation and is virtual d. None of these ans/- d. None of these 7. The union of primary keys of the related entity sets becomes a

Solve-write C program to find grade of student by using nested else-if statement

C program to find grade of student by using nested else-if statement Problem Description This program take input as your number then show your grade. Problem Solution 1. enter your marks as input. 2. then check your marks with 'If' block's condition. if it satisfied then show your grade as output. 3. if it not satisfied then it checks with all else-if block's condition repeatedly. 4. print the grade according to your given marks as input and exit. Program codes:- #include<stdio.h> main() { int n; printf("\n enter the marks:"); scanf("%d",&n); if(n>89) printf("O"); else if(n>79) printf("E"); else if(n>69) printf("A"); else if(n>59) printf("B"); else if(n>49) printf("C"); else if(n>39) printf("D"); else printf("F"); } Program explanation:- 1. enter your marks. for example we take 70 .

Fundamentals of computer science tutorial (FCST)

Search This Blog