Database Tester
Filter interviews byDatabase Tester Interview Questions and Answers
Updated 24 Aug 2024
Q1. Difference between union and union all
Ans.
Union combines and removes duplicates, Union All combines without removing duplicates.
Union combines result sets and removes duplicates
Union All combines result sets without removing duplicates
Union is slower than Union All as it involves removing duplicates
Union requires sorting while Union All does not
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Database Tester • 4-6 years
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₹ 6 L/yr - ₹ 12 L/yr
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