title: How do I export oracle sql developer table schema by using pl/sql scripts?
body: <p>everyone knows how to export table schema by using Export Wizard,
  but how can I export them by using pl/sql script?</p>
  <p>For example,
  I want to export all Table schema which begin with &quot;SYS&quot;(ex:SYS_ROLE, SYS_USER_ROLE, SYS_USER, etc.)
  Many thanks!!</p>