Can you please solve these two questions using the table given. This problems are from my Discrete Mathematic Class about "Relations and Database". Please NOTE that for question 18 and 20, just write the SQL code and the result. No need to write the relational algebra and relational calculus forms.

Name Chan, Jimmy East, Jane King. Dorothy England Kovalsco, Beet U.S Lau, Won Nkoma, Jon Quercos, TomMexico U. S Kernya Book ISBN 0-115-01214-1 Birds of Africa 0-364-87547-X Early Tang Paintings BellmanArt 0-56-000142-8 Springtime GardeningSwift-Key Nature 0-816-35421-9 Springtime Gardening Harding Nature Title Publisher Subject Loraine Nat Harding Art 0-816-53705-4 Baskets for Today 0-816-88506-0 Autumn Annuals Harding Nature For Exercises 17-23, using the relation tables given before Exercise 7,e SOL, and relational calculus forms. Also give the result of each query 18. Give the titles of all books published by Harding. 20. G ive the names of all authors who have written nature books