In this 12th session of the SQL webinar series, we will introduce Subqueries by defining some terms and writing a few examples.  A subquery is simply a 'nested query' or a query inside another query.  There are two types of subqueries: Simple and Correlated.  In this session, we will start with Simple Subqueries and follow up in the next webinar on October 24th with Correlated Subqueries.