As a seasoned developer with over 8 years of experience, my skillset extends far beyond just Java and SQL. I'm more than competent in HTML, CSS, JavaScript, jQuery, JSP, Servlet, Springboot, and even REST and SOAP API functionalities. Therefore, I'm quite familiar with database management and have worked alongside different database models like MariaDB and PostgreSQL - thus your JPEG to SQL conversion would not be a problem for me. I comprehend the complexity that comes with queries containing joins and sub-queries as you've mentioned.
My prior experiences in web scraping align perfectly with your needs; I am well-versed in OCR technologies and Image Processing. This means I can precisely extract the textual information from the JPEG images without losing any context or detail, facilitating an efficient transition of the SQL queries to digital format at your convenience.
Lastly, being a self-sufficient and detail-oriented individual, I can manage this project without direct oversight - delivering accurate results promptly. Trust in my adeptness and let's simplify your database management together!