Illustration strms046.htm shows the following process for row migration during dequeue by a messaging client:

1. A user or application enqueues a row LCR that updates the `hr.employees` table into a queue at an Oracle database. In the LCR, the old value for the `department_id` column is `50`. The new value for this column is `90`.

2. A messaging client dequeues the LCR and transforms the `UPDATE` into a `DELETE` because the change satisfies a subset rule.