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Use DISTINCT only when necessary, as it can cause high overhead due to sorting.

CASE statements are more flexible and often faster than multiple UNION operations. 4. Oracle Database Performance Tuning oracle

Oracle remains a market leader by adapting to new technological paradigms, specifically AI and Cloud. For organizations, mastering the modern Oracle ecosystem means not only understanding SQL but also leveraging autonomous features, vector search, and cloud-native services to drive efficiency and innovation. Use DISTINCT only when necessary, as it can

Add a section with (e.g., how to create a vector index). Use DISTINCT only when necessary