Multiple choice technology databases The two types of subqueries are: Single-row subquery, Double-row subquery Double-row subquery, Multiple-row subquery Multiple-row subquery Single-row subquery and Multiple subquery Reveal answer Fill a bubble to check yourself D Correct answer Explanation Subqueries are classified by how many rows they return: single-row subqueries return one row (use =, >, <), multiple-row subqueries return multiple rows (use IN, ANY, ALL). Option D correctly identifies both types.