Oracle SQL Complete Notes for Interview | SELECT, Cardinality, NULL, NVL, DISTINCT Explained | Packiyaraj Raja
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Oracle SQL Complete Notes for Interview | SELECT, Cardinality, NULL, NVL, DISTINCT Explained | Packiyaraj Raja
⚠️ Brutal Truth About Oracle SQL Interviews Most candidates fail… Not because they don’t know SQL. They fail because they don’t understand: 👉 What Cardinality really means 👉 Why NULL destroys calculations 👉 Why DISTINCT doesn’t fix bad joins 👉 Why M:M joins explode data 👉 Why SELECT 555 FROM emp returns multiple rows ...
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