{"product_id":"9781491941171","title":"SQL and Relational Theory: How to Write Accurate SQL Code","description":"SQL is full of difficulties and traps for the unwary. You can avoid them if you understand relational theory, but only if you know how to put that theory into practice. In this book, Chris Date explains relational theory in depth, and demonstrates through numerous examples and exercises how you can apply it to your use of SQL. \u003cp\u003e This third edition has been revised, extended, and improved throughout. Topics whose treatment has been expanded include data types and domains, table comparisons, image relations, aggregate operators and summarization, view updating, and subqueries. A special feature of this edition is a new appendix on NoSQL and relational theory. \u003c\/p\u003e\u003cul\u003e \u003cli\u003eCould you write an SQL query to find employees who have worked at least once in every programming department in the company? And be sure it’s correct? \u003c\/li\u003e\n\u003cli\u003eWhy is proper column naming so important? \u003c\/li\u003e\n\u003cli\u003eNulls in the database cause wrong answers. Why? What you can do about it? \u003c\/li\u003e\n\u003cli\u003eHow can image relations help you formulate complex SQL queries? \u003c\/li\u003e\n\u003cli\u003eSQL supports \"quantified comparisons,\" but they’re better avoided. Why? And how? \u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eDatabase theory and practice have evolved considerably since Codd first defined the relational model, back in 1969. This book draws on decades of experience to present the most up to date treatment of the material available anywhere. Anyone with a modest to advanced background in SQL can benefit from the insights it contains. The book is product independent.\u003c\/p\u003e","brand":"O'Reilly Media, Incorporated","offers":[{"title":"Default Title","offer_id":42474649518141,"sku":"9781491941171","price":39.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0603\/0838\/9949\/files\/9781491941171_p0.jpg?v=1771571363","url":"https:\/\/www.tatteredcover.com\/products\/9781491941171","provider":"Tattered Cover","version":"1.0","type":"link"}