As opposed to databases that are Transactional Processing oriented i.e. where you can delete, update, and enter new data etc..., QlikView is a read-only data retrieval system. In QlikView, data is handled through an ETL (Extract-Transform- Load) process but QlikView in not concerned with the UPDATE, DELETE and INSERT operations rather is more interested in querying and retrieving specific sets of data for analysis.
To answer to your question, In QlikView you can well load data from your QVD, then Export those loaded data to an external file like *.csv, *.txt etc... . And finally import them from your database. As explained by Ashfaq, Expressor could be used as well.
But, I can’t see why you should go through this process? What do you want to achieve by doing so?