Relational database select operations remove columns that fulfill requirements. Is this answer correct?

how to build a bookstore database with   Entities for Tables Books This entity will store information about the books in the bookstore, such as title, author, publisher, and publication date. The table could also include additional fields such as genre, language, and the number of pages. Authors This entity will store information about the authors of the books in the bookstore, such as name, date of birth, nationality, and biography. The table could also include additional fields such as gender, education, and awards. Bookstore Members This entity will store information about the bookstore members, such as name, address, phone number, email address, and membership status. The table could also include additional fields such as date of birth, occupation, and membership type.

Describe the principles of indexing in database systems. How does indexing impact query performance, and what types of indexes are commonly used?

What is one possible consequence of inappropriate indexing choices?