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I'm working on a web app, and it part of it, there is a very simple database-driven file/document manager. As a file manager, there is the possibility of sub-folders. So in the DB, I have the ...
At my company every foreign key has a NOT NULL constraint on it, and if it really needs to be null in some cases, a default value is assigned (like 999999) and given a row in the referring table like ...
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