The document discusses key concepts in entity relationship diagrams including entities, attributes, entity sets, relationships, relationship sets, cardinality, roles, and identifiers. It defines entities as people, places, objects or events and describes their attributes. It also covers the different types of relationships that can exist between entities like one-to-one, one-to-many, many-to-one, and many-to-many. Finally, it discusses primary keys, foreign keys, and the importance of identifying keys for looking up and linking information between tables.

1. ENTITY RELATIONSHIP DIAGRAM BY MEER SADAF NAEEM

2. Part-1 Understanding the Fundamentals

3. BASIC CONCEPTS

8. ATTRIBUTES Descriptive properties possessed by each member of an entity set. Student Name Address Class Roll number Percentage

10. STUDENT A STUDENT B STUDENT C STUDENT D Mr. A Mr.D Mr. C Mr. B ENTITY SET : STUDENT ENTITY SET : TEACHER

12. RELATIONSHIP SET/TYPE: A set of relationships of the same type.

13. Student A Student C Student B Mr. C Mr. B Mr. A ENTITY SET : STUDENT ENTITY SET : TEACHER RELATIONSHIP SET : SUBJECT

14. DEGREE OF RELATIONSHIP SET The number of entity sets that participate in a relationship set.

15. Student A Student C Student B Mr. C Mr. B Mr. A ENTITY SET : STUDENT ENTITY SET : TEACHER RELATIONSHIP SET : SUBJECT

19. Student Name Address Class Roll number Date-of-birth

22. ONE TO MANY A B a1 a4 a2 a3 b4 b3 b2 b1

23. MANY TO ONE A B b2 a1 a2 a5 b3 b2 b1 a3 a4

24. ONE TO ONE A B a1 a2 a3 a4 b4 b3 b2 b1

25. MANY TO MANY A B a1 a3 a2 b4 b3 b2 b1 a4

29. Student A Student C Student B Mr. C Mr. B Mr. A ENTITY SET : STUDENT ENTITY SET : TEACHER RELATIONSHIP SET : SUBJECT

31. MR.A MR.C MR.D MR.B CALCULUS JAVA DBMS FACULTY COURSES RELATIONSHIP SET:COURSE

34. Part-2 Introducing to Identifiers