Cannot set column names to numbers or symbols in postgresql / rails -

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i need add columns in table tournament. columns correspond specific ranking , of boolean type. rankings name in real life : 40, 30/5, 30/4, 30/3 ect ect dont think can writte migration in rails :

class addrankingstotournaments < activerecord::migration   def change      add_column :tournaments, :40, :boolean     add_column :tournaments, :30/5, :boolean     add_column :tournaments, :30/3, :boolean   end end

this not valid column names in rails , postgresql right ? best shot rename column names correct , still easy indentify ?


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