Which of the following queries contains an equality join? a. SELECT title, authorid FROM books, bookauthor WHERE books.isbn ¼ bookauthor.isbn AND retail > 20; b. SELECT title, name FROM books CROSS...

Which of the following queries contains an equality join?

a. SELECT title, authorid

FROM books, bookauthor

WHERE books.isbn ¼ bookauthor.isbn

AND retail > 20;

b. SELECT title, name

FROM books CROSS JOIN publisher;

c. SELECT title, gift

FROM books, promotion

WHERE retail >¼ minretail

AND retail

d. none of the above