sql - A simple database version control -

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if have table stores questions and answers, example using column called such parent. if question doesn't have value in parent, it's question , if does, reply, how version control this?

for well-developed example of how keep past revisions of text, @ mediawiki database layout. database layout used mediawiki software, many wikis (notably wikipedia) run on. specifically, page, revision, , text tables primary tables involved keeping track of historic changes.


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