Parallel select for many tables oracle

parallel select for many tables oracle ( parallélisation select plusieurs tables oracle )

As an example of parallel query with intra- and inter-operation parallelism, consider a more complex query:

SELECT /*+ PARALLEL(employees 4) PARALLEL(departments 4) USE_HASH(employees) 
ORDERED */
 MAX(salary), AVG(salary) 
FROM employees, departments
WHERE employees.department_id = departments.department_id 
GROUP BY employees.department_id;

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