ARDUINO IDE   list and state the function of the different Arduino programming commands.

How do "volatile" variables function in programming, especially in multi-threaded applications?

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.

Distinguish triggers from stored routines.

Differentiate between modal and non-modal overlays.