duckdb-for-local-analytics

Answers an analytical question with SQL over the Parquet or delimited tables that were already persisted, instead of another pass of row-by-row code over the source. Use when a question asks for revenue, counts or averages per group, a ranking of segments or channels, or one period compared with the period before it, when an analysis is being written as iteration over rows, when a file is larger than the memory available to load it, or when the same source is re-read and re-cleaned for every new question.