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Shashank Mishra on Instagram: "“For a MySQL table with ~1M rows and 50 columns, which runs faster for SUM(colA): GROUP BY or a Window Function — and why?” • In most real systems, GROUP BY is faster when you only need aggregated results. • Window functions are more expensive because they preserve all rows and compute aggregates over partitions. ⸻ ➤ What MySQL is doing internally • GROUP BY – Scans rows – Builds aggregation state (hash or sort based) – Collapses data into one row per group – Produ