Chapter 12 Conclusion

In this chapter, we embarked on a journey through SQL, a declarative language specifically designed to manage data stored in relational databases. We started with a brief historical review, tracing its origins back to IBM labs in the 1970s, to better understand the motivations behind SQL's creation and its enduring relevance.

Then, we ventured into the practical elements of SQL. We explored the syntax of SQL, which is notably different from Python and other popular programming languages, but it has its own clarity and logic. We studied the structure of SQL statements, learned about keywords, identifiers, operators, and expressions. We examined the basic but powerful operations that SQL allows us to perform on data: SELECT for data retrieval, INSERT for adding new data, UPDATE for modifying existing data, and DELETE for removing data.

We then delved into more complex queries involving sorting (ORDER BY), filtering (WHERE), and aggregation (GROUP BY). These...