Two years and two weeks ago, we launched N1QL in Couchbase 4.0 on a crisp fall day at Wall Street in New York, which solved the critical business problem of manipulating JSON data as a set using SQL-like queries. The product has grown rapidly with hundreds of customers using it in production, who have continued to innovate building modern scalable applications and contributing to the community on the Couchbase N1QL forum. Since the initial release, we've learned from use cases and enhanced query and indexing language, performance, and capabilities in all releases, including novel indexing technology that has improved performance by orders of magnitude. We're delighted to release the second edition of the N1QL book with updates to reflect the features in Couchbase 5.0, which is now available as a downloadable PDF and special edition guide.