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Tools

DuckDB: fast SQL analytics on Parquet, CSV and DataFrames without a server
DuckDB is an in-process analytical database: no server, just a library. Here is how to query files and DataFrames directly, and where it fits next to pandas, Postgres and Spark.
RecallRun Editors · 29 Sept 2026 · 3 min read
Tech articles

Composite indexes in SQL: why column order decides everything
How a multi-column B-tree index is actually used, the leftmost-prefix rule, and a simple way to choose column order for filters, ranges and sorting, with EXPLAIN examples.
RecallRun Editors · 21 Sept 2026 · 3 min read

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