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How does SO store its revisions in the database?

Does it use diffs? If so, what algo does it use?

share|improve this question If you compose a query, you'll see the schema that SE sites use. It appears there's a PostHistory table. – Mark Peters Apr 13 '11 at 20:57
@Mark, the datadumps are not necessarily a 100% copy of The Real Thing, I guess? But surely close enough to answer this question indeed – maybe post as an answer? Some additional detail: the PostHistory indeed holds the Markkdown. Also related: What revision library does stackoverflow use? – Arjan Apr 13 '11 at 21:01

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