This open-source app lets you convert spreadsheet files (e.g. CSV/excel), JSON files, or pasted data to SQL in-clauses or CREATE TABLE/INSERT INTO TABLE combinations. Let's you easily move data into your warehouse for ad hoc analyses. All processing is client-side so your data stays with you. I have it hosted at sqlgenerator.io but you can also clone it and self-host it for security with your own internal applications.