A SQL-level standard wouldn't do much because different apps will be using different database schemas anyway. (It's similar to how two applications that both us

A SQL-level standard wouldn't do much because different apps will be using different database schemas anyway. (It's similar to how two applications that both use JSON format usually aren't going to be compatible, because they use it to store different things.) Only generic, schema-independent database tools and libraries would be helped. For a portable application file format, you'd want to pick a SQL implementation (probably SQLite), decide on a schema, and probably wrap it in a library, but once you do that it could be used in multiple apps.