Chapter 15 Conclusion
This chapter took us through an intensive exploration of advanced SQL features. We started with an understanding of subqueries, which offer the ability to perform multiple layers of data retrieval in a single query, thereby increasing the complexity and depth of the queries we can create. We saw how subqueries can be used to compute averages, find maximums and minimums, and perform other comparisons across different scopes of data.
We then moved on to stored procedures, a powerful SQL feature that allows you to encapsulate and store a series of SQL statements for later use. We examined how stored procedures can reduce network traffic, promote code reuse, and enhance security by restricting direct access to the database tables.
Next, we explored triggers, an advanced SQL feature that allows us to automatically execute a defined set of SQL statements based on certain events or conditions. Triggers enhance data integrity, can automate system maintenance, and provide...