Some embodiments provide a non-transitory machine-readable medium that stores a program. The program receives a set of data for a record in a first table. The set of data comprises a set of values for a set of attributes. The first table comprises a first set of columns. A first column in the first set of columns in the first table is configured to refer to a second column in a second set of columns in a second table. The program further generates the record in the first table. The program also generates a value for the first column in the first set of columns in the first table based on a subset of the set of values for a subset of the set of attributes. The program further stores the value in the first column in the first set of columns of the record.