Summary
This chapter covered the important topic of optimizing SQL queries for performance. It explained the various methods for scanning databases, discussed the PostgreSQL server query planner, and introduced the EXPLAIN command and the EXPLAIN ANALYZE command, which were used to display the plan for a query. With these topics, you should now have a better understanding of the data retrieval mechanisms for PostgreSQL, which will help you write optimized queries that have better performance.
In the next two chapters, you will dive into the processing of specific data types. In Chapter 11, you will start with JSON and Array. Then, in Chapter 12, you will move on to Date, Text, and Geographical data.
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