The decision-support (OLAP) applications commonly use order-based analysis functions like Rank, Cumulative Total, Moving Average. In past, the applications were forced to compute these important analysis functions outside the database. This resulted in loss of performance and inconvenience. In the NCR Teradata RDBMS V2R3.0.0, we have taken the lead by providing these functions as part of the extended SQL. In this paper we describe the feature and the algorithms. The feature allows computations on very large data sets and makes it significantly faster than what was previously possible.