100 Days of SQL Optimisation (Day #44)

See how does the choice of column data type (BIGINT vs. VARCHAR) affect join performance in DuckDB!

Joining on BIGINT columns significantly outperforms VARCHAR columns in both execution time and memory usage. In this benchmark, the BIGINT join was approximately 1.4x faster and used nearly half the memory compared to the VARCHAR join. This highlights the importance of choosing efficient data types for high-performance queries, as string comparisons inherently add computational overhead.

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