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Joseph M. Hellerstein introduces the relational data model, schema design, and declarative query processing in UC Berkeley CS186.
[Recorded: November 5, 2008] The roots of "personal computers" - that is, machines that are not shared between users - date back to at least the late 1950s. Within a decade, several more of these "one machine, one user" computers were developed; and the idea of a user having direct control over the computer was established, at least within academia.