A method and mechanism for performing an operation based on multidimensional data in a relational database. A query is generated that includes a first set of instructions to select a portion of multidimensional data for inclusion in a relational cube and a second set of instructions to group the portion of multidimensional data in the relational cube using at least two or more levels of granularity of at least one dimension, thereby causing a relational cube to be generated. Based on a received request for an operation to be performed, the query is modified to include a third set of instructions that represent the requested operation; and the query is submitted to the relational database engine of the relational database management system. Thereafter, the operation is performed against the relational cube.