What is meant by recursive relationship Database Management Systems 10CS54 VTU notes 8 Marks Jun July 2013June 2016

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What is meant by recursive relationship? Database Management Systems - 10CS54 VTU notes 8 Marks (Jun / July 2013/June 2016)

Bring out the importance of role names in ecursive relationship, with an example?:


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A relationship can relate two entities of the same entity type ; for example, a SUPERVISION relationship type relates one EMPLOYEE (in the role of supervisee ) to another EMPLOYEE (in the role of supervisor ). 
This is called a recursive relationship type. A relationship type can have attributes; for example, HoursPerWeek of WORKS_ON; its value for each relationship VTUlive.com 17 instance describes the number of hours per week that an EMPLOYEE works on a PROJECT. Structural constraints on relationships: Cardinality ratio (of a binary relationship): 1:1, 1:N, N:1, or M:N. Participation constraint (on each participating entity type): total (called existence dependency ) or partial. 
Alternative (min, max) notation for relationship structural constraints: Specified on each participation of an entity type E in a relationship type R. Specifies that each entity e in E participates in at least min and at most max relationship instances in R. Default(no constraint): min=0, max=n. 


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