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Equivalence of calculus and algebra
For every relational algebra query there is an equivalent tupel calculus query.
For every tupel calculus query there is an equivalent relational algebra query.
Translation algebra calculus is fairly straightforward and can be used to obtain tc queries from ra queries.
Translation calculus algebra is very artificial and does not result in readable ra queries.
We will show (and do exercises) on algebra to calculus translation.
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