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SQL Myth Busted: NULL Is NOT Zero (This Mistake Breaks Queries!)

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SQL Myth Busted: NULL Is NOT Zero (This Mistake Breaks Queries!)

Most developers get this wrong—even after years of writing SQL. NULL ≠ 0 NULL ≠ empty string NULL ≠ false In SQL, NULL means UNKNOWN, and it follows three-valued logic. That’s why NULL = NULL is NOT TRUE and why your filters sometimes return unexpected results. 🚨 Common mistakes: Using = instead of IS NULL Forgetting that ...

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