I hav been trying to learn sql 2005 from lyk a month or two and i think i have done a good job. Now i was about to try some security stuff in it but i saw that sql 2008 is in market. Can any body suggest me that what is the difference between the two and can I swich to sql 2008? what ever i learned in sql 2005 will i be the same in 2008. And for trying it 1ce oe twice can I dwnload express edition of sql 2008. whats da difference between the original and express edition?