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What do you understand by “safety of expressions”?

      

What do you understand by “safety of expressions”?

  

Answers


BONFACE
It is possible to write tuple calculus expressions that generate infinite relations. For example {t/~te R} results in an infinite relation if the domain of any attribute of relation R is infinite. To guard against the problem, we restrict the set of allowable expressions to safe expressions.
Mwalimu Bonface answered the question on March 1, 2018 at 10:33


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