This document discusses analytical functions in Teradata. It describes various types of analytical functions including window aggregate functions like AVG, COUNT, MAX, MIN, SUM, rank functions like RANK and PERCENT_RANK, row number functions like ROW_NUMBER, and Teradata-specific functions like CSUM, MAVG, MDIFF, MSUM, and QUANTILE. It provides examples of how to use these functions with WINDOW clauses like PARTITION BY and ORDER BY.