Modern businesses require online multipart collaboration to efficiently service their clients, and this requirement forces them to allow collaborating businesses to access their data. The immediate consequence is that the collaborating businesses routinely combine (join) their data with data that belong to several other parties. At the same time, all of the collaborating parties legitimately pose access constraints and combination (join) constraints to all other parties for their data, in an effort to maintain the usability and collaborative force of information sharing.
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