Practical Oracle SQL: Mastering the Full Power of Oracle Database
- 5h 51m
- Kim Berg Hansen
- Apress
- 2020
Write powerful queries using as much of the feature-rich Oracle SQL language as possible, progressing beyond the simple queries of basic SQL as standardized in SQL-92. Both standard SQL and Oracle’s own extensions to the language have progressed far over the decades in terms of how much you can work with your data in a single, albeit sometimes complex, SQL statement. If you already know the basics of SQL, this book provides many examples of how to write even more advanced SQL to huge benefit in your applications, such as:
- Pivoting rows to columns and columns to rows
- Recursion in SQL with MODEL and WITH clauses
- Answering Top-N questions
- Forecasting with linear regressions
- Row pattern matching to group or distribute rows
- Using MATCH_RECOGNIZE as a row processing engine
The process of starting from simpler statements in SQL, and gradually working those statements stepwise into more complex statements that deliver powerful results, is covered in each example. By trying out the recipes and examples for yourself, you will put together the building blocks into powerful SQL statements that will make your application run circles around your competitors.
What You Will Learn
- Take full advantage of advanced and modern features in Oracle SQL
- Recognize when modern SQL constructs can help create better applications
- Improve SQL query building skills through stepwise refinement
- Apply set-based thinking to process more data in fewer queries
- Make cross-row calculations with analytic functions
- Search for patterns across multiple rows using row pattern matching
- Break complex calculations into smaller steps with subquery factoring
Who This Book Is For
Oracle Database developers who already know some SQL, but rarely use features of the language beyond the SQL-92 standard. And it is for developers who would like to apply the more modern features of Oracle SQL, but don’t know where to start. The book also is for those who want to write increasingly complex queries in a stepwise and understandable manner. Experienced developers will use the book to develop more efficient queries using the advanced features of the Oracle SQL language.
About the Author
Kim Berg Hansen is a database developer from Middelfart in Denmark. As a youngster he originally wanted to work with electronics, and he tried computer programming and discovered that the programs he wrote worked well―unlike the electronics projects he soldered that often failed. This led to a VIC-20 with 5 kilobytes RAM and many hours programming in Commodore Basic.
In this Book
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Correlating Inline Views
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Pitfalls of Set Operations
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Divide and Conquer with Subquery Factoring
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Tree Calculations with Recursion
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Functions Defined Within SQL
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Iterative Calculations with Multidimensional Data
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Unpivoting Columns to Rows
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Pivoting Rows to Columns
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Splitting Delimited Text
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Creating Delimited Text
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Analytic Partitions, Ordering, and Windows
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Answering Top-N Questions
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Ordered Subsets with Rolling Sums
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Analyzing Activity Logs with Lead
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Forecasting with Linear Regression
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Rolling Sums to Forecast Reaching Minimums
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Up-and-Down Patterns
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Grouping Data Through Patterns
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Merging Date Ranges
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Finding Abnormal Peaks
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Bin Fitting
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Counting Children in Trees
