Enroll Course: https://www.udemy.com/course/sql-49-section-5/
If you’re seeking to elevate your SQL skills, especially when it comes to working with subqueries, the course ‘실무 SQL 완전정복 – SECTION 5: 하위 쿼리 마스터하기’ on Coursera is an exceptional resource. This particular section offers an in-depth exploration of subqueries, which are crucial for complex data analysis and efficient database querying. The course starts by explaining what subqueries are, their purposes, and the various types available, including single-row and multi-row subqueries. It then dives into advanced topics such as using comparison operators with subqueries, leveraging IN and NOT IN clauses, and understanding multi-row subqueries with ANY, SOME, ALL, and EXISTS/NOT EXISTS. Further, the course covers correlated subqueries, nested subqueries, and the application of subqueries within SELECT, HAVING, and FROM clauses, including inline views. The lessons are structured to build a solid foundation before progressing to more complex concepts, making it suitable for intermediate learners aiming to deepen their SQL expertise. After completing this course section, you’ll be able to write more efficient, powerful, and precise queries involving subqueries, significantly enhancing your data analysis capabilities. Whether you’re a data analyst, developer, or database administrator, mastering these techniques will undoubtedly empower your SQL skills and improve your work efficiency.
Enroll Course: https://www.udemy.com/course/sql-49-section-5/