The following query expressed in SQL is given. SELECT B.author, B.title FROM Books B, Borrow R WHERE B.bid=R.rid AND B.publisher="ACM" AND R.date>=’1/1/2020’ a) Translate SQL statement into relational algebra. b) Suppose we have a B+ tree on the attribute Borrow.date. How many pages does the query read if our system uses the block nested-loops join solely? Recall that the buffer pool includes 5000 pages. Would an additional index on Books.publisher speed up the query?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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The following query expressed in SQL is given.
SELECT B.author, B.title
FROM Books B, Borrow R
WHERE B.bid=R.rid
AND B.publisher="ACM"
AND R.date>=’1/1/2020’
a) Translate SQL statement into relational algebra.
b) Suppose we have a B+ tree on the attribute Borrow.date. How many pages
does the query read if our system uses the block nested-loops join solely? Recall that
the buffer pool includes 5000 pages.
Would an additional index on Books.publisher speed up the query?  

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