Null checks, duplicate checks, referential checks, row counts taken before and after a join, and the schema that has drifted overnight can all be written down in SQL, tested, and kept under version ...
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Here are a few SQL interview gems that can really separate those who only know basics from those who understand the nuances: 1️⃣ 2nd Highest Salary with duplicates in mind 2️⃣ Delete duplicates but ...
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