The best way I can describe this is to imagine a large database sorted on a persons name but the name appears many times in the database under different years, different jobs etc. Lets take an example of Lahmans baseball database or baseball reference just to visualize. You have a player who has played many years on many different teams even multiple teams in the same year. He has also played multiple positions on those multiple teams. Lets now say we want to see his fielding stats for a particular year broken down by position or his batting stats for the year no matter on how many teams he has played. Can this be done?
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