Which of the following is also known as the control key?
Correct answer: D. Foreign key
- A. Sort key
- B. Composite key
- C. Primary key
- D. Foreign key
Explanation
The text in the image appears to be incorrect. A control key is a special key on a computer keyboard that, when pressed in combination with another key, performs a specific action. For instance, the Ctrl+C key combination is used to copy text Foreign keys are a concept in relational databases. A foreign key is a column, or set of columns, in one table that references the primary key of another table. Foreign keys are used to enforce data integrity by ensuring that the data in one table is consistent with the data in another table
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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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