Main Page | See live article | Alphabetical index 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. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.