Date: 2012-09-29 08:58 pm (UTC)
Вот еще один похожий:
Many times, a son has the same name as his father. (George Abbott had a son named George.) Find all such pairs, and list their names, the father's birth date, and the son's birth date.

Получается только выбрать всех, у кого в принципе есть отцы (father.person.id), а вот как смэтчить с именами отцов - не понимаю.
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