I made an app that lets you bulk-upload PDFs and then export recognized text as SQL, JSON, or CSVs.
You can see a video demonstration on the front page of the website: https://siftrics.com/
MySQL, PostgreSQL, and Microsoft SQL Server are officially supported.
If you have any questions about the product itself or the engineering that makes it work, please ask!
Discussion on HN: https://news.ycombinator.com/item?id=21649918
Discussion on /r/programming: https://www.reddit.com/r/programming/comments/e2jbhn/query_pdfs_with_sql_i_made_an_app_that_lets_you/