can someone help me with these questions?

9:62 Spring 2018 which of the following is not a valid SELECT statement? Homework #2. Lab Topic: Simple SELECT. Page 3 of S SELECT cost-retail FROM books SELECT retail+cost FROM books; SELECT retail retail retail FROM books; d. SELECT retail 3 from books; 10. When must a comma be used in the SELECT clause of a query when a field name is followed by a column alias to separate the SELECT clause and the FROM clause when It's never used in the SELECT clause. b. only one field is selected c. d. when listing more than one filed name and the fields aren't c when an arithmetic expression is included in the SELECT clause 11. Which of the following commands a. SELECT titles books, category FROM books; b. SELECT title, books, and category FROM books; listing of plays a listing of the category for each book in the BOOKS ta c. SELECT title, cat FROM books; d. SELECT books, lIcategory "Categories" FROM books; Which clause is not required in a SELECT statement? 12. a. b. c. d. SELECT FROM WHERE All of the above clauses are required 13. Which of the following lines of the SELECT statement contains an error? 1 SELECT title, isbn, pubdate "Date of Publication" 3 FROM books line 1 line 2 line 3 There are no errors. a. c. d. Which of the following lines of the SELECT statement contains an error? 1 SELECT ISBN, 2 retail-cost 3 FROM books; 14. a. line 1 b. line 2 c.line 3 d. There are no errors