The text discusses the process of migrating from a SQL database to Couchbase, emphasizing the need to adjust primary keys and migrate business logic to the application layer. It explains how to perform JOIN operations on Couchbase by updating foreign keys using N1QL Data Manipulation Language, which involves converting number fields to strings for key consistency. The document also highlights the challenges of migrating SQL structures like sequences, views, domains, triggers, and functions, noting that these elements require reimplementation in the application layer since Couchbase lacks direct equivalents. The text concludes by suggesting that a comprehensive migration should involve data model analysis and potential denormalization, and invites readers to share their experiences with SQL migrations.