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The _ _ _ _ _ specifies whether each entity supertype occurrence must also be a member of at least one subtype. a . uniqueness
The specifies whether each entity supertype occurrence must also be a member of at least one subtype.
a uniqueness factor
b attribute inheritance
c completeness constraint
d specialization hierarchy
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Joe Celkos Data And Databases Concepts In Practice
Authors: Joe Celko
1st Edition
1558604324, 978-1558604322
