What is correlated subquery in SQL?
Introduction to Correlated Subqueries Ever run into a SQL problem where you need to compare each row with some calculation based on related data? That’s where correlated subqueries come in handy. These are special subqueries that reference columns from the outer query, essentially creating a link between the inner and outer parts of your query. What makes them different from regular subqueries is that they run once for each row the outer query processes. This makes them perfect for row-by-row operations where each calculation depends on the current row’s values. ...