Final answer:
The correct answer is E. All of the above are basic requirements of a relational database.
The correct statement that is not a basic requirement of a relational database is C, as foreign keys must correspond to primary keys, not other foreign keys, in relational databases.
Step-by-step explanation:
The statement 'Foreign keys must have values that correspond to the value of another foreign key in another table' is not a basic requirement of a relational database. The correct requirement is that foreign keys must correspond to the value of a primary key in another table, not another foreign key.
Therefore, the correct answer to the question, 'Which of the following is not a basic requirement of a relational database?' is C. Foreign keys must have values that correspond to the value of another foreign key in another table.
Answer A, B, and D describes fundamental rules that apply to the relational database model:
- Answer A. Every column in a row must be single valued (atomicity).
- Answer B. Primary keys cannot be null (uniqueness and not null constraint).
- Answer D. All nonkey attributes in a table should describe a characteristic about the object identified by the primary key (entity integrity).
In a relational database, every column in a row must be single valued, meaning that each attribute in a table must have only one value for each record. Primary keys cannot be null, as they are used to uniquely identify each record in a table. Foreign keys must have values that correspond to the value of another foreign key in another table, ensuring data integrity and consistency.
All nonkey attributes in a table should describe a characteristic about the object identified by the primary key, ensuring that the data stored in the table is relevant and meaningful.