How to take advantage of parallel SQL select?

Is it possible to take advantage of a parallel SQL select by specifying computations over the constituent subsets before they are consolidated? For example, suppose I have a very large table of sales employees, and I want to generate a sales report for each one in an efficient manner. Would it be possible to perform a parallel SQL select over the entire table, and pass each subset of employees to a report generation batch job? Or, perhaps this is a poor strategy and you have a better approach in mind.
Thanks in advance for your reply.

Parallel Query (PQ) is an Oracle feature that parallelises a vanilla standard SQL for you.
In other words, when designing the SQL you do not design it for each parallel process processing a specific set of data.
The CBO determines all that. Whether it can be done in parallel (not all SQL is equal and not all SQL can be executed using PQ). How many PX slaves from the PQ pool can be used/are available for use. What range of data each of the processes will be processing. Etc.
Suggest you read Parallelize the Workload in the Oracle® Database Performance Tuning Guide.

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How to take advantage of parallel SQL select?

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