<Tr> <Td> St. Louis Cardinals (NL) </Td> <Td> 11 </Td> <Td> 2011 </Td> <Td> 19 </Td> </Tr> <Tr> <Td> Oakland Athletics (AL) † </Td> <Td> 9 </Td> <Td> 1989 </Td> <Td> 14 </Td> </Tr> <Tr> <Td> San Francisco Giants (NL) † </Td> <Td> 8 </Td> <Td> 2014 </Td> <Td> 20 </Td> </Tr> <Tr> <Td> Boston Red Sox (AL) † </Td> <Td> 8 </Td> <Td> 2013 </Td> <Td> 12 </Td> </Tr>

What is the difference between the al and nl