SQL EXISTS and NOT EXISTS - Vlad Mihalcea
SQL EXISTS and NOT EXISTS - Vlad Mihalcea
Jan 28, 2020
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Manish | Data Career Mentor on Instagram: "Why do SQL developers debate EXISTS vs IN? Let’s break it down. Simple. Practical. Real SQL logic. • SQL IN compares values. It checks if a value exists in a list. The subquery runs first. Then SQL matches the result. • SQL EXISTS checks presence. It doesn’t care about actual values. It only checks: Does a row exist? It stops at the first match. • SQL IN has a hidden risk. If the subquery returns NULL. Results can become unpredictable. Silent bugs appea
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