Bøger af Chris Fehily

Read this book for free at sqlrun.com. Perfect for end users, analysts, data scientists, and app developers, this best-selling guide will get you up and running with SQL, the language of databases. You'll find general concepts, practical answers, and clear explanations of what the various SQL statements can do. Hundreds of examples of varied difficulty encourage you to experiment and explore. Full-color SQL code listings help you see the elements and structure of the language. You can download the sample database to follow along with the author's examples.Covers Oracle, Microsoft SQL Server, IBM DB2, MySQL, PostgreSQL, and Microsoft Access.Learn the core language for standard SQL, and variations for the most widely used database systems.Organize your database in terms of the relational model.Master tables, columns, rows, and keys.Retrieve, sort, and format data.Filter the data that you don't want to see.Convert and manipulate data with SQL's built-in functions and operators.Use aggregate functions to summarize data.Create complex SQL statements by using joins, subqueries, constraints, conditional logic, and metadata.Create, alter, and drop tables, indexes, and views.Insert, update, delete, and merge data.Execute transactions to maintain the integrity of your data.Avoid common pitfalls involving nulls.Troubleshoot and optimize queries.Plenty of tips, tricks, and timesavers.Fully cross-referenced, linked, and searchable.ContentsIntroduction1. Running SQL Programs2. The Relational Model3. SQL Basics4. Retrieving Data from a Table5. Operators and Functions6. Summarizing and Grouping Data7. Joins8. Subqueries9. Set Operations10. Inserting, Updating, and Deleting Rows11. Creating, Altering, and Dropping Tables12. Indexes13. Views14. TransactionsAbout the AuthorChris Fehily is a statistician and author based in San Francisco.

Neighbors with hand-labeled DVD collections. Teenagers with 5000-song iPods. Entire countries sharing the same copy of Windows. Who are these people? They're file sharers and they account for a third of worldwide internet traffic. Their swag is anything that can be digitized and copied. But file-sharing networks aren't only for pirates. Musicians and writers use them to gauge their popularity. Artists and filmmakers use them to boost recognition. Government employees use them to secretly download WikiLeaks archives. TV producers use them to confirm audience measurements. Politicians and judges use them to make policy and rulings. Traders and marketers use them to spot trends. Learn how BitTorrent and peer-to-peer networks work Set up a BitTorrent client and find files to download Open, play, read, or run what you download Know the risks of file sharing and avoid fakes, scams, and viruses Fully indexed and cross-referenced Contents 1. The Terrain 2. Understanding BitTorrent 3. File Types 4. Malware 5. Archives 6. Installing a BitTorrent Client 7. BitTorrent Search Engines 8. Finding Torrents 9. Customizing Your Client 10. Downloading Torrents 11. Movies and TV Shows 12. Pictures 13. Music and Spoken Word 14. Books, Documents, and Fonts 15. Applications and Games

2024 update. Author site: fehily.com. This book teaches newcomers SQL, the language of databases, and includes examples for the most widely used database systems. In all its editions, this book has sold more than 150,000 copies and is popular with end users, students, data scientists, statisticians, epidemiologists, analysts, app developers, webmasters, and hobbyists. Thorough cross-referencing makes it a useful desktop reference for experienced SQL programmers.Covers Oracle Database, Microsoft SQL Server, Microsoft Access, IBM Db2 Database, MySQL, PostgreSQL, and Standard SQL.Hundreds of examples of varied difficulty encourage you to experiment and explore.Download the sample database and SQL source code to follow along with the examples.Organize your database in terms of the relational model.Master tables, columns, rows, and keys.Retrieve, filter, sort, and format data.Use functions and operators to transform and summarize data.Create, alter, and drop database tables.Answer hard questions by using joins, subqueries, constraints, conditional logic, and metadata.Create indexes that speed sorts and searches.Use views to secure and simplify data access.Insert, update, delete, and merge data.Execute transactions to maintain the integrity of your data.Avoid common pitfalls involving nulls.Troubleshoot and optimize queries.Learn advanced techniques that extend the power of SQL.ContentsIntroduction1. Running SQL Programs2. The Relational Model3. SQL Basics4. Retrieving Data from a Table5. Operators and Functions6. Summarizing and Grouping Data7. Joins8. Subqueries9. Set Operations10. Inserting, Updating, and Deleting Rows11. Creating, Altering, and Dropping Tables12. Indexes13. Views14. Transactions15. Advanced SQLAbout the AuthorChris Fehily is a statistician and author living in Carmel, California.