Plug-in for Oracle APEX by United Codes
APEX Dynamic Action plug-in for automatic database-driven constraint validations. Instant format, limit, and constraint validations for SQL table/view-based APEX Forms and Interactive Grids. Inform your users about data integrity problems with clear explanations in real-time at the input fields. Explain problems and suggest solutions. 10x faster than the free version.
On plug-ins-pro.com you can see the documentation, sample app, and download.