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COUNT(*) vs COUNT(column) in SQL & Databases

Learn about COUNT(*) vs COUNT(column) in this comprehensive SQL & Databases development tutorial. A subtle bug.

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1The NULL Difference

COUNT(*) counts the number of ROWS in the table, regardless of what's in them. COUNT(email) counts the number of rows where the email column is NOT NULL. If 10 users haven't provided an email, COUNT(*) might be 100, while COUNT(email) will be 90.