Computer Science · Database Management Systems
Why is the UNION ALL operator generally preferred over the UNION operator in reporting queries when duplicate elimination is not required?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1It executes faster because it does not perform a distinct sort operation to remove duplicates✓
- 2It explicitly removes duplicates automatically
- 3It natively supports the WHERE clause while UNION does not
- 4It guarantees that the final output preserves the exact clustered index order
Correct answer
It executes faster because it does not perform a distinct sort operation to remove duplicates
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