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The Relational Model and Normalization
Which of the following is not a restriction for a table to be a relation?
The cells of the table must contain a single value.
All of the entries in any column must be of the same kind.
The columns must be ordered.
No two rows in a table may be identical.
Correct Answer:
The columns must be ordered.
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The Relational Model and Normalization
A functional dependency is a relationship between or among:
When the values in one or more attributes being used as a foreign key must exist in another set of one or more attributes in another table, we have created a(n):
The functional dependency R → S means that the value of S can be determined when we are given a value of R.
A candidate key is a determinant that determines all the other columns is a relation.
In a relation, the rows are sometimes called "fields."
A relation is in 5NF when multivalued dependencies are isolated in their own relation.
Keys made up of two or more attributes are called composite keys.
A functional dependency is a relationship between or among attributes.
A primary key is a composite key that was selected to be the main identifier for the relation.
A relation is a two-dimensional table.
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