mySQL HAVING, GROUP BY - условие к GROUP BY, пример SQL запроса. Условие на группу

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Такой пример:

SELECT user_id, user_name, SUM(r_count) AS recalls_count
 FROM user_settings WHERE (noindex = 0)  GROUP BY user_id   
  HAVING (recalls_count > 0) 
	ORDER BY user_id LIMIT 400 , 2000

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