The database query language SQL pops up in all sorts of places when you’re working with data — especially big data — and can be a very useful way to query data in spreadsheets, APIs and coding. This video, made for students on the MA in Data Journalism at Birmingham City University, explains what SQL is, the different places you will come across it, and how to get started with SQL queries.
Another way of running SQL purely from your browser is to use DuckDb, which allows you to point to a CSV URL, for example, and run queries on that file: https://blog.ouseful.info/2022/02/11/sql-databases-in-the-browser-via-wasm-sqlite-and-duckdb/