rse

       Is a record selection expression that forms the record stream
       that controls the number of times DEC DATATRIEVE executes
       the statement and controls the single-record context for the
       statement.

    statement

       Is either a simple or a compound statement you want DEC
       DATATRIEVE to execute once for each record in the record
       stream formed by the RSE. You can form compound DEC DATATRIEVE
       statements with the BEGIN-END, IF-THEN-ELSE, and THEN statements,
       which are described in this chapter.