for that i think you'll have to search and read a bit for yourself: it's far to much for a forum post to highlight for you.
https://www.google.com/search?q=difference+between+sql+2005+and+sql+2008
https://www.google.com/search?q=difference+between+sql+2005+and+sql+2008R2
https://www.google.com/search?q=difference+between+sql+2005+and+sql+2012
Lowell
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