1. A method comprising the computer-implemented steps of: receiving, at a relational database server, a relational database statement that involves data, from one or more n-dimensional data objects, that is stored according to a multidimensional schema; determining, by said relational database server, that said statement requires an operation on particular data from said n-dimensional data objects; sending, from said relational database server to a multidimensional database server, an expression that specifies said operation; wherein said relational database statement conforms to a first language supported by said relational database server; wherein said expression conforms to a second language supported by said multidimensional database server and not supported by said relational database server; based on said expression, executing, by said multidimensional database server, said operation on said particular data; and providing to said relational database server, by said multidimensional database server and in response to said relational database statement, a set of one or more values resulting from execution of said operation on said particular data.