Which of the following are the properties of the relation?
Correct answer: D. All of the above
- A. Each attribute has a unique name
- B. No two rows in a relation are Identical
- C. There are no multivalued attributes in a relation
- D. All of the above
Explanation
Improve the performance of the database: This is the most common reason to create indexes. Indexes act like a special filing system for your database table, allowing the database to quickly locate specific rows of data without having to scan the entire table. This can significantly speed up queries that filter or sort data based on the indexed columns.Document the structure of the database itself: Indexes can help document the structure of a database by revealing which columns are frequently used for filtering and sorting data. This information can be helpful for database administrators and developers who are trying to understand how the database is being used.Reduce data dependency for application program: By improving the performance of queries, indexes can indirectly reduce the data dependency for application programs. This is because applications will wait less time for data to be retrieved from the database.
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Databases cover tables, records, fields, keys and relationships, together with database management systems and relational database design. The subject includes primary and foreign keys, normalization, SQL commands such as SELECT, INSERT, UPDATE and DELETE, queries, forms and reports, while distinguishing a database from a spreadsheet used for simple tabular data.
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