Here are the phases of a software product life cycle, explained chronologically from its installation request to its deprecation and removal. Updates occur during production as they do not interrupt nor interfere with the operating system installation. Optimizers use algebraic identities to rewrite, and hence optimize, expressions, which in turn optimizes query evaluation programs. Another option that's coming available now is to use an Annotation. New, innovative programming abstractions, languages, calculi, models, frameworks, etc.
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