Subqueries - EXISTS operator
50.2
Exercise

Subqueries - EXISTS operator - 1

Write a query to list the names of authors who have written at least one book which was published either in 2010 or earlier. Set the header for the single column of results, to be name.

Note: Even if you find other ways of doing it, try doing it using EXISTS operator in a subquery, just for the sake of your better understanding of the topic.