Computer Science · SQL Structured Query Language
In SQL, what is the primary operational difference between the UNION and UNION ALL operators?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1UNION removes duplicate rows from the combined result set, while UNION ALL retains all rows including duplicates.✓
- 2There is no functional or performance difference between the two operators.
- 3UNION executes faster than UNION ALL because it bypasses sorting.
- 4UNION ALL automatically eliminates duplicate rows, while UNION retains them.
Correct answer
UNION removes duplicate rows from the combined result set, while UNION ALL retains all rows including duplicates.
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