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In a M:N relationship between STUDENT and CLASS at a university, it is possible that a class may start with no students and a student
In a M:N relationship between STUDENT and CLASS at a university, it is possible that a class may start with no students and a student may start with no classes. If a database designer is using the symbol using the Chen model, what is the designer hoping to establish between these entities?
An optional relationship.
A cardinality figure.
A domain of possible values.
A set of optional identifiers.
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Database Systems Introduction To Databases And Data Warehouses
Authors: Nenad Jukic, Susan Vrbsky, Svetlozar Nestorov
1st Edition
1943153191, 978-1943153190
