Scalar. The first call to this function returns 1, and then each subsequent call returns a value larger than that returned by the previous call.
The return value from subsequent calls to NEXTVAL() always increases, but not necessarily by one; the increase may be larger. Sybase CEP Engine maintains state for NEXTVAL() by project instance, using a separate sequence for each instance. If persistence is enabled for your project, calling NEXTVAL() after a restart returns a value larger than the last call to NEXTVAL() before the restart. Each call to NEXTVAL() returns a new value, even if it is called more than once in a single statement.
INSERT INTO OutStream SELECT Price, Nextval() FROM InStream;