<Tr> <Td> 124 </Td> <Td> ABC </Td> <Td> Acme Supply Co </Td> <Td> IL </Td> <Td> </Td> </Tr> <P> Another method is to add' effective date' columns . </P> <Table> <Tr> <Th> Supplier_Key </Th> <Th> Supplier_Code </Th> <Th> Supplier_Name </Th> <Th> Supplier_State </Th> <Th> Start_Date </Th> <Th> End_Date </Th> </Tr> <Tr> <Td> 123 </Td> <Td> ABC </Td> <Td> Acme Supply Co </Td> <Td> CA </Td> <Td> 01 - Jan - 2000 </Td> <Td> 21 - Dec - 2004 </Td> </Tr> <Tr> <Td> 124 </Td> <Td> ABC </Td> <Td> Acme Supply Co </Td> <Td> IL </Td> <Td> 22 - Dec - 2004 </Td> <Td> NULL </Td> </Tr> </Table> <Tr> <Th> Supplier_Key </Th> <Th> Supplier_Code </Th> <Th> Supplier_Name </Th> <Th> Supplier_State </Th> <Th> Start_Date </Th> <Th> End_Date </Th> </Tr>

What is a slowly changing dimension data warehouse