Write the relational algebra expression for the following problems.

1-List all the data about authors

2-Im looking to read a book but Im interested in how many pages it has.

3-I want to read a short book (

4-Find the name of the publisher for the book title The Book

5-Find the authors name and book title for all books

Relation Scheme for Books Database Authors au id au fnameau_Iname phone address city state zip PK 1..1 FK FK Title_Authors title_id auid au order royalty_share PK Publishers pub_id pub_name Cl state country PK 1..1 FK Titlestitle_idtitle_name type pub_id pagesprice sales pubdate contract PK 1..1 1..1 FK title_id PK Royalties advance royalty_rate