The relational calculus refers to the two calculi, the tuple calculus and the domain calculus, that are part of the relational model for databases and that provide a declarative way to specify database queries. This in contrast to the relational algebra which is also part of the relational model but provides a more procedural way for specifying queries.
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... makeup of the town is 96.20% White, 0.57% African American, 0.06% Native American, 1.41% Asian, 0.02% Pacific Islander, 0.96% from other races, and 0.78% from two or more ...