After defining the Teradata PT script objects required for a job, you must code the executable (processing) statement to specify which objects the script will use to execute the job tasks and the order in which the tasks will be executed. The APPLY statement, described in the Object Definitions and the APPLY Statement section of the Teradata Parallel Transporter Reference (B035-2436) may also may also include data transformations by including filter operators or through the use of derived columns in its SELECT FROM.
A job script must always contain at least one APPLY statement, and if the job contains multiple steps, each step must have an APPLY statement.