mysql - sql query - calculating commission over 12 months -

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I am trying to write a question of how much commission my client earns in one month

< Pre> SELECT (rate * SUM (duration) / 180) Teacher, person, as a commission by WHERE person.id = teacher.person_id and lesson.teacher = person.id and MONTH (start_time) = month ( NOW ()) GROUP BY person.id

This is fine to work this month, but how can I do this to give results for the last 12 months?

use GROUP BY person.id, MONTH (start_time) and last and in WHERE in MONTH (NOW ()) - MONTH (start_time) & lt; = 12 .


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