ANSWERS: 2
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The FAT is just a way that clusters on the disk are allocated to files. It's basically a map which says "cluster 5 belongs to myfile.txt, and so does cluster 6". A database is a whole 'nuther animal altogether: it's a set of related tables and an "engine" used to query and update those tables. They're really not even 2 things that someone would normally be comparing. It's a bit like asking how is a firetruck like a turtle... people assume there's a punchline :)
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There isn't a huge difference - FAT is basically a list of what belongs where on a hard drive and a database is (at its simplest) just a list of information about whatever the database contains - names, addresses, etc.
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