Question
Download Solution PDFIn an Entity-Relationship (ER) model, suppose π is a many-to-one relationship from entity set E1 to entity set E2. Assume that E1 and E2 participate totally in π and that the cardinality of E1 is greater than the cardinality of E2.
Which one of the following is true about π ?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFAs the number of entries in E1 is greater than the number of entries in E2
As participation is total,
R is an onto function from E1 to E2
As participation of both the entity sets is total and number of entries in E1 is greater than E2, R is an onto function.
: : Partial/Optional participation
: : Total/Mandatory participation or Existence dependency
Last updated on Jan 8, 2025
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