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Under what circumstances are composite primary keys appropriate? a . as identifiers of composite entities, where each primary key combination is allowed only once in
Under what circumstances are composite primary keys appropriate? a as identifiers of composite entities, where each primary key combination is allowed only once in the M:N relationship b as identifiers of weak entities, where the weak entity has a strong identifying relationship with the parent entity c All of these choices are correct. d None of these choices are correct.
Under what circumstances are composite primary keys appropriate?
a as identifiers of composite entities, where each primary key combination is allowed only once in the M:N relationship
b as identifiers of weak entities, where the weak entity has a strong identifying relationship with the parent entity
c All of these choices are correct.
d None of these choices are correct.
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Spatial Database Systems Design Implementation And Project Management
Authors: Albert K.W. Yeung, G. Brent Hall
1st Edition
1402053932, 978-1402053931
