6. Entity Relationship Diagram (cont.) Student A ENTITY SET : STUDENT Student B Student B Mr A Mr B Mr B ENTITY SET : TEACHER RELATIONSHIP SET : SUBJECT
16. TOTAL PARTICIPATION The participation of an entity set E in a relationship set R is said to be TOTAL if every entity in E participates in at least one relationship in R. Student A ENTITY SET : STUDENT Student B Student B Mr A Mr B Mr B ENTITY SET : TEACHER RELATIONSHIP SET : SUBJECT
17. PARTIAL PARTICIPATION Mr A ENTITY SET : DEPARTMENT Mr B Mr B PB204 P2113 BBC101 ENTITY SET : COURSES RELATIONSHIP SET : COURSE The participation an entity set E in a relationship set R is said to be PARTIAL if only some entities in E participate in relationships in R.