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Question
A total completeness constraint is represented by _________.a. a smaller circle inside a bigger circle
b. a rhombus inside a circle
c. a double horizontal line under a circle
d. a single horizontal line above a circle
Answer
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Related questions
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A dependency of one nonprime attribute on another nonprime attribute is a partial dependency.
a. True
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a. True
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a. True
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A table is in 2NF if it is in 1NF, and it includes no partial dependencies.
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a. True
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In the context of partial dependencies, data redundancies occur because every row entry requires duplication of data.
a. True
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a. True
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A table is in BCNF if every determinant in the table is a foreign key.
a. True
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Normalization is a process that is used for changing attributes to entities.
a. True
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From a data modeling point of view, ___________--data refer to data whose values change over time and for which one must keep a history of the data changes.
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______________is the bottom-up process of identifying a higher-level, more generic entity supertype from lower-level entity subtypes.a. Specializationb. Generalizationc. Normalizationd. Total completeness
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Overlapping subtypes are subtypes that contain_______--- subsets of the supertype entity set.a. nullb. exclusivec. solitaryd. nonunique
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a. Subtype sets are unique.
b. Supertype has optional subtypes.
c. Subtype discriminators cannot be null.
d. Subtype does not have a supertype.
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The hierarchical model is software-independent.a. Trueb. False