Description of the illustration
This image is partially described in the accompanying text. In addition:
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It shows a typical breaking of the data into A-G, H-M, N-S, and T-Z
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It adds the concept of the data flowing gradually from the employees table to the user process
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It shows intra-operation parallelism for the full table scan and the ORDER BY operation
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It shows the inter-operation parallelism for going between those two inter-operation parallelisms
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The SQL statement is SELECT * FROM employees ORDER BY last_name;