Merge relation is important because

Explanation

The correct answer is Both A and B.Different views may need to be integrated. In a database, different users may have different views of the same data. For example, a salesperson might see a list of customers and their contact information, while a manager might see a list of customers and their purchase history. Merging relations allows you to combine data from different views into a single relation.New data requirements may produce new relations to be merged. As your database evolves, you may need to create new relations to store new data. Merging relations allows you to combine these new relations with existing relations.In conclusion, merging relations is a useful technique for integrating data from different views and for combining new data with existing data.