2. Consider the following schema: Books (book_id, title, year, pub_id, auth_id, price) Authors(auth_id, name, nationality) Publisher(pub_id, name) Sales(copies_sold, book_id, copies_printed) Write down the relational algebra expressions for the following queries a) Give the count of the books published by Pearson each year. b) Name the authors who wrote some book in 2015 and 2016 priced above 200 rupees. c) List the title, author name and publisher name of books written by Indian authors in the year 2019 d) List the publisher IDs with least number of books printed in 2020 e) List the publisher who made profit<500 (profit= book price* (copies printed – copies sold) f) List the author whose books are priced the highest.

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SQL

SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.  

Queries

A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prior to displaying the results. A search query is one type of query that many people perform several times per day. A search query is executed every time you use a search engine to find something. When you press the Enter key, the keywords are sent to the search engine, where they are processed by an algorithm that retrieves related results from the search index. Your query's results are displayed on a search engine results page, or SER.