SQL pocket guide

If you use SQL in your day-to-day work as a data analyst, data scientist, or data engineer, this popular pocket guide is your ideal on-the-job reference. You'll find many examples that address the language's complexities, along with key aspects of SQL used in Microsoft SQL Server, MySQL, Oracle Database, PostgreSQL, and SQLite. In this updated edition, author Alice Zhao describes how these database management systems implement SQL syntax for both querying and making changes to a database. You'll find details on data types and conversions, regular expression syntax, window functions, pivoting and unpivoting, and more. --

Previous edition: as by Jonathan Gennick. 2011.

Preface -- Why SQL? -- Goals of This Book -- Updates to the Fourth Edition -- Navigating This Book -- Conventions Used in This Book -- Using Code Examples -- O’Reilly Online Learning -- How to Contact Us – Acknowledgments -- 1. SQL Crash Course ; What Is a Database? ; SQL ; NoSQL ; Database Management Systems (DBMS) ; A SQL Query ; The SELECT Statement ; Order of Execution ; A Data Model -- 2. Where Can I Write SQL Code? ; RDBMS Software ; SQLite ; MySQL ; Oracle ; PostgreSQL ; SQL Server ; Database Tools ; Connect a Database Tool to a Database ; Other Programming Languages ; Connect Python to a Database ; Connect R to a Database -- 3. The SQL Language ; Comparison to Other Languages ; ANSI Standards ; SQL Terms ; Keywords and Functions ; Identifiers and Aliases ; Statements and Clauses ; Expressions and Predicates ; Comments, Quotes, and Whitespace ; Sublanguages -- 4. Querying Basics ; The SELECT Clause ; Aliasing Columns ; Qualifying Columns ; Selecting Subqueries ; DISTINCT ; The FROM Clause ; From Multiple Tables ; From Subqueries ; The WHERE Clause ; Filtering on Subqueries ; The GROUP BY Clause ; The HAVING Clause ; The ORDER BY Clause ; The LIMIT Clause -- 5. Creating, Upd…