What is the prerequisite of independence
Correct answer: B. A relation must have primary key associated with it
- A. Table must have unique name
- B. A relation must have primary key associated with it
- C. A relation may not have primary key
- D. Should be in zero normalization level
Explanation
A relation must have a primary key associated with it is the correct answer. In relational database theory, a primary key is a minimal set of attributes that uniquely identifies each record in a table. First Normal Form (1NF) is the basic level of database normalization that ensures every attribute value in a column is atomic (cannot be further decomposed). A primary key is a requirement for a relation to be in 1NF
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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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