please how to write these sql statement using relational algebra expression:

Consider the following schema:

Publisher (name, phone, address), PK: name.

Book (ISBN, title, year, published_by, previous_edition), PK: ISBN, FK: published_by refs Publisher, previous_edition refs Book.

Author (SSN, first_name, last_name, address, income), PK: SSN.

Write(aSSN, bISBN), PK: (aSSN, bISBN), FK: aSSN refs Author, bISBN refs Book.

Author_Editor(aeSSN, works_for), PK: aeSSN, FK: aeSSN refs Author, works_for refs Publisher.

1. Provide the SSN of those authors who have coauthored all the books written by Andy Smith.
2. Provide the SSN of those authors who have coauthored at least one book with the author named Andy Smith.