Quote: Codd's relational algebra is like an algebra of punched cards; each card is a record; each step an operator, closed under composition; good abstraction

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[Codd] observed that in the old days people … did a simple task. One would sort the … To some extent you can think of Codd's … an operator. The operators are closed under composition: … [plug board] machines, but people programmed at a fairly high level of …   Google-1   Google-2

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Related Topics

Topic: relational database (35 items)
Topic: abstraction in programming (67 items)