SQL Cookbook
Cód:
491_9780596009762
You know the rudiments of the SQL query language, yet you feel you arent taking full advantage of SQLs expressive power. Youd like to learn how to do more work with SQL inside the database before pushing data across the network to your applications. Youd like to take your SQL skills to the next level.Lets face it, SQL is a deceptively simple language to learn, and many database developers never go far beyond the simple statement: SELECT columns FROM table WHERE conditions. But there is so much more you can do with the language. In the SQL Cookbook, experienced SQL developer Anthony Molinaro shares his favorite SQL techniques and features. Youll learn about:Window functions, arguably the most significant enhancement to SQL in the past decade. If youre not using these, youre missing outPowerful, database-specific features such as SQL Servers PIVOT and UNPIVOT operators, Oracles MODEL clause, and PostgreSQLs very useful GENERATE_SERIES functionPivoting rows into columns, reverse-pivoting columns into rows, using pivoting to facilitate inter-row calculations, and double-pivoting a result setBucketization, and why you should never use that term in Brooklyn.How to create histograms, summarize data into buckets, perform aggregations over a moving range of values, generate running-totals and subtotals, and other advanced, data warehousing techniquesThe technique of walking a string, which allows you to use SQL to parse through the characters, words, or delimited elements of a stringWritten in OReillys popular Problem/Solution/Discussion style, the SQL Cookbook is sure to please. Anthonys credo is: When it comes down to it, we all go to work, we all have bills to pay, and we all want to go home at a reasonable time and enjoy whats still available of our days. The SQL Cookbook moves quickly from problem to solution, saving you time each step of the way.
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