실무 SQL 완전정복 - SECTION 5 : 하위 쿼리 마스터하기

Dive deep into subqueries with this comprehensive course! You'll master the art of using nested queries to enhance your SQL skills.

Here's what you'll learn:

• Understanding Subqueries: Discover what subqueries are and their primary purposes in SQL. We'll explore the different types of subqueries and where they can be effectively utilized within a SQL statement.
• Single-Row Subqueries: Learn how to leverage comparison operators with single-row subqueries to retrieve specific data.
• Multiple-Row Subqueries (IN/NOT IN): Gain proficiency in using the IN and NOT IN operators with multiple-row subqueries for efficient data filtering.
• Advanced Multiple-Row Subqueries: Explore the power of ANY, SOME, ALL, EXISTS, and NOT EXISTS clauses to construct sophisticated multiple-row subqueries.
• Correlated and Nested Subqueries: Master correlated subqueries and understand how to effectively work with multiple nested subqueries for complex data retrieval.
• Subqueries in SELECT and HAVING Clauses: Learn how to incorporate subqueries directly within the SELECT and HAVING clauses to refine your query results.
• Inline Views (Subqueries in FROM Clause): Discover inline views, which are subqueries used within the FROM clause to create temporary result sets for enhanced query readability and efficiency.

This course provides a thorough understanding of subqueries and their applications, empowering you to write more powerful and efficient SQL queries.