A null value is used to represent the zero digit in a relation.
Answer: FALSE
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Information Analysis Chapter 9
- Designing the database for an Internet-based electronic commerce application differs significantly from the process followed when designing the database for other types of applications.
- Multiple key retrieval is possible with the hashed file organization.
- Random key retrieval on the primary key is comparatively slow with the hashed file organization.
- Indexes should be used judiciously for databases that support transaction processing and other applications with heavy updating requirements.
- When using the sequential file organization, the addition of rows requires rewriting the file.
- A physical file is a named set of table rows stored in a contiguous section of secondary memory.
- Denormalization reduces the chance of errors introduced by normalizing relations.
- Generally speaking, a physical table corresponds to a relation.
- A derived field is a field that can be derived from other database fields.
- A relation is said to be in second normal form when there are no transitive dependencies.
- A relation is said to be in second normal form if the primary key consists of only one attribute.
- An attribute can be functionally dependent on more than attribute.
- Normalization is based on an analysis of weak entities.
- A relation is said to be in second normal form when its nonprimary key attributes do not depend on each other.
- Referencing a relation, the sequence of columns cannot be interchanged without changing the meaning or use of the relation.
- Each row of a relation corresponds to a record that contains data values for an entity.
- Object-oriented database models are the most frequently used database technologies for new information systems development.
- File and database design occurs in two steps.
- The index file organization:
- A field of data that can be used to locate a related field or row of data best describes:
- The process of splitting or combining normalized relations into physical tables based on affinity of use of rows and fields best describes:
- A named set of rows and columns that specifies the fields in each row of the table best describes:
- A single name that is used for two or more different attributes best defines:
- Merging relations is also referred to as: