Download e-book for iPad: Oracle SQL Recipes: A Problem-Solution Approach by Grant Allen

By Grant Allen

ISBN-10: 1430225092

ISBN-13: 9781430225096

Have you been confronted with a brand new form of question to put in writing, or been requested to create an unexpected database item? In such occasions, you've most likely sought after a great, strong instance upon which to construct, and as a substitute were pressured into the drudgery of parsing railroad-style syntax diagrams in Oracle's guide set. This e-book frees you from that drudgery through delivering established and dealing examples of SQL used to resolve universal difficulties confronted through builders and database directors every day. if you find yourself stressed to get effects speedy, Oracle SQL Recipes is there at your aspect.

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Additional resources for Oracle SQL Recipes: A Problem-Solution Approach

Example text

This is the first point where we use the COUNT function on the results of another query, rather than raw data in a table. Partial output at this subselect would look like this. EMPLOYEE_ID JOBSHELD ----------- ---------100 1 101 3 102 2 103 1 104 1 … Our outermost query also performs straightforward aggregation and grouping, once again employing the COUNT function on the results of a subselect—which itself was producing counts of derived data. 2-8. Finding Duplicates and Unique Values in a Table Problem You need to test if a given data value is unique in a table—that is, it appears only once.

This means that in a simple example like this one, text is sorted according to the numeric equivalent on the code page in use (US7ASCII, WEISO8859P1, and so on). In these code pages, upper- and lowercase letters have different values, with uppercase coming first. This is why the uppercase SMITH has sorted before all other names starting with a capital S. What most people would expect to see are the two “Smith” values sorted together, regardless of case. This NLS directive achieves that result. info CHAPTER 1 ■ THE BASICS How It Works Oracle supports both case-sensitive and case-insensitive sort orders.

JOB_HISTORY, building a basic result set that repeats an EMPLOYEE_ID for every position an employee has held. Partial results of just the inner UNION ALL statement are shown here to help you follow the logic. info CHAPTER 2 ■ SUMMARIZING AND AGGREGATING DATA 102 102 103 … Union vs. Union All It’s useful to remember the difference between UNION and UNION ALL. UNION will remove duplicate entries in result sets (and perform a sort on the data as part of deduplication), whereas UNION ALL preserves all values in all source sets, even the duplicates.

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Oracle SQL Recipes: A Problem-Solution Approach by Grant Allen


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