Modify the first char

Hi! I've a query

INSERT fields...
SELECT fields

in the select I've a field with this format

XX05

How Can I modify the first 2 char with 20 for have 2005 ????

In the select I want to modify all the first 2 char in '20' of this field

Thanks Received on Fri Jun 09 2006 - 14:44:46 CDT