Table operators read one or more input tables, perform operations on the data such as partitioning or aggregation, then write output rows. Table operators can accept an arbitrary row format for each input table and, based on the operation and input row types, they can produce an arbitrary output row format. For more information on the table operators that Teradata provides, see SQL Functions, Operators, Expressions, and Predicates, B035-1145. For more information on creating table operators, see SQL External Routine Programming , B035-1147 .