I recently took a big gamble on DuckDB. I've added it to the core of qStudio a free SQL editor. Now within the editor you can save table results from any database to the local duckdb instance or you can even perform joins amongst any server and I do mean almost any server. Out of the box DuckDB supports mysql/postgresql but I've added support for 20+ other database though it probably doesn't support all their types. If you want to get started with DuckDB qStudio is a good IDE: https://www.timestored.com/qstudio/duckdb-file-viewer#qduckd...