Question: Consider the Bellow schema for a library database and write relational algebra expressions for the following queries Author (authorname, citizenship, birthyear) Book(isbn title, authorname) Topic(isbn,

Consider the Bellow schema for a library database and write relational

Consider the Bellow schema for a library database and write relational algebra expressions for the following queries Author (authorname, citizenship, birthyear) Book(isbn title, authorname) Topic(isbn, subject) Branch(libname. city) Instock (isbn, libname, quantity) Give all authors' names born after 1940. |Give the names of libraries in Sydney. Give the book name and cities where each book is held. Give the title of each book on the topic of either alcohol or drugs. Give the title and author of each book of which at least two copies are held in branch located in Melbourne

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