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?
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
Section: Chapter Questions
Problem 1PE
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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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