UPDATE Table SET
HouseNumber = LEFT(AddressField, CHARINDEX(' ', AddressField)),
StreetName = RIGHT(AddressField, LEN(AddressField) - LEN(LEFT(AddressField, CHARINDEX(' ', AddressField))) - 1)
UPDATE Table SET
StreetName = RIGHT(AddressField, LEN(AddressField) - LEN(LEFT(AddressField, CHARINDEX(' ', AddressField))) - 1)
UPDATE Table SET
AddressField = LEFT(AddressField, CHARINDEX(' ', AddressField)),
CHARINDEX(' ', AddressField))) - 1)