ThisTechGirl | Coding & System Design on Instagram: "Both returns the same value still former is faster than later..here is why 1️⃣ COUNT(*) counts rows, not data COUNT(*) only checks whether a row exists and increments a counter. 👉 It does not read any column values at all. Internals: Uses metadata / row pointers DBs: MySQL, Postgres, Oracle 2️⃣ COUNT(column) must inspect each value COUNT(column) checks every row to see if the column is NULL or not. 👉 This means extra work per row 🐌 Internal
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