Oracle SQL Recipes by Grant Allen; Bob Bryla; Darl Kuhn

By Grant Allen; Bob Bryla; Darl Kuhn

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Here are the results of the inline view's SELECT statement. DEPARTMENT ID ------------20 40 50 60 70 80 DEPARTMENT NAME ----------------Marketing Human Resources Shipping IT Public Relations Sales 6 rows selected. CHAPTER 1 ■ THE BASICS The inline view now acts as if you had a table, D, defined with this structure. DEPARTMENTS table, which are implicitly inherited by our inline view. The outer SELECT statement queries the result set, just as if there were a real table d and you’d written this statement against it.

Depending on the logic in your ODCIAGGREGATEITERATE function, you may have particular actions that must happen in a particular order and thus want to avoid parallelism. Enabling parallel processing also implies that logic is in place in the ODCIAGGREGATEMERGE member function to deal with merged subsets of results. The AGGREGATE USING T LIST OF STRINGS clause is where all the magic happens. This line instructs the function that it is aggregate in nature, and an object of type T LIST OF STRINGS should be instantiated with the input parameter, kicking off the actual aggregation work.

You can spot this in your own work if you see any combination of duplicating database capabilities in code, shuffling temporary data and results around needlessly, and similar less-than-efficient tasks. Oracle is exploding with this kind of functionality now, especially with the introduction of On-Line Analytical Processing capabilities (OLAP) over the last few major versions. After you’ve explored these recipes for summarizing and aggregating data, you’ll realize that Oracle is the number one tool at your disposal to satisfy a huge range of reporting and other requirements.

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