Which key doesn't hold uniqueness property?
Correct answer: D. Secondary Key
- A. Candidate Key
- B. Foreign key
- C. Primary Key
- D. Secondary Key
Explanation
A secondary key is made on a field that you would like to be indexed for faster searches A table can have more than one secondary key. The main purpose of a database is to store and search for data
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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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