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Question
Normalization is a process that is used for changing attributes to entities.a. True
b. False
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 determinant is any attribute whose value determines other values within a column.
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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Converting a database format from 1NF to 2NF is a complex process.
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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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Repeating groups must be eliminated by ensuring that each row defines a single entity.
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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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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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The " __________________" characteristic of a primary key states that the primary key must uniquely identify each entity instance, must be able to guarantee unique values, and must not contain nulls.a. unique valuesb. nonintelligentc. preferably single-attributed. security-complaint
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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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c. Subtype discriminators cannot be null.
d. Subtype does not have a supertype.
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The relational data model was developed in the_______ . a. 1960s b. 1970sc. 1980s d. 1990s
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A(n)__________ is a restriction placed on the data.a. attribute b. entityc. relationship d. constraint
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The external model is the representation of the database as "seen" by the DBMS.
a. True
b. False