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What is the Python API for DuckDB used for? What is DuckLake? What is columnar storage, and how does DuckDB use it? What is the DuckDB CLI? What are DuckDB extensions? What is MotherDuck? How do you troubleshoot memory issues when DuckDB processes a dataset larger than available RAM? What does "in-process" mean for a database like DuckDB? What is the difference between DuckDB's vectorized execution and traditional row-at-a-time execution? What formats can DuckDB query directly? What is Parquet, and why does DuckDB work well with it? What is zero-copy integration with Pandas/Arrow? What is the httpfs extension used for? What is ATTACH used for in DuckDB? Why does DuckLake store metadata in a database instead of files, unlike Iceberg/Delta Lake? Explain the execution flow of a query in DuckDB from SQL to result? What is DuckDB? Why is DuckDB often described as "SQLite for analytics"? What is vectorized query execution in DuckDB? What is a row group in DuckDB's storage format?

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