Why COUNT(column) is slower than COUNT(*) ⬇️ ✅ COUNT(column) ignores NULL values : ✔ It only counts rows where the column has non-NULL value. ✔ Extra checking makes it slower. ——————————————————— ✅ COUNT(*) counts rows directly : ✔ It simply counts total rows in a specific table. ✔ Database engines optimize it internally for faster execution. ——————————————————— ✅ More CPU overhead in count(column) : ✔ The database checks each row for NULL condition. ✔ This adds processing cost. ————————————————
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