Does anyone know the meaning of this query

a question from 1z0-001 exam
SELECT manager_id, last_name, hire_date, salary, AVG (salary) OVER (PARTITION BY manager_id ORDER BY hire_date ROWS BETWEEN 1 PRECEDING AND 1 FOLLOWING) AS C_mavg FROM employees;
i know partitions are created at the creation of table..but can they be created in selects??
what does ROWS BETWEEN 1 PRECEDING AND 1 FOLLOWING do?/
on what is the partition created..and can't we write a normal query other than this
thank u
rajiv

Analytics, man. "Partition" here is creating a moving window across the resultset. You could always run the code to see what it does. Alternativley, read the documentation.
Cheers, APC

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Does anyone know the meaning of this query

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