Question 1

Can データポータル run SQL on CSV files?

Accepted Answer

Yes — SQL Query mode uses DuckDB WASM locally against CSV/Parquet without uploading to a server.

Question 2

Is there an in-browser Postgres?

Accepted Answer

Postgres Playground runs PGlite in your browser for local SQL experiments.

Question 3

Does it connect to my database?

Accepted Answer

No — paste or load files locally; there is no remote database tunnel.