Updates

Evolution of data and metada is a challenging issue. We investigate foundation of update languages and mesure the expressive power of update primitives with the following motivation. The three basic update primitives for relational databases are the insertion, the deletion of a tuple and the modification of the components of a tuple in a relation. These three primitives are simple, natural and common place. Suprisingly enough, they are hardly ever questioned
although SQL is providing much more powerful versions of the three basic update operations.

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