Subqueries that are introduced with unmodified comparison operators often include scalar aggregate functions, which return a single value.
For example, to find the names of books that are priced higher than the current minimum price:
select title from titles where price > (select min(price) from titles)
title --------------------------------------------------- The Busy Executive’s Database Guide Cooking with Computers: Surreptitious Balance Sheets Straight Talk About Computers Silicon Valley Gastronomic Treats But Is It User Friendly? Secrets of Silicon Valley Computer Phobic and Non-Phobic Individuals: Behavior Variations Is Anger the Enemy? Life Without Fear Prolonged Data Deprivation: Four Case Studies Emotional Security: A New Algorithm Onions, Leeks, and Garlic: Cooking Secrets of the Mediterranean Fifty Years in Buckingham Palace Kitchens Sushi, Anyone?