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Question: Which clause returns only one copy of each set of duplicate rows selected?
Answer1: Unique
Answer2: Group By
Answer3: Distinct
Answer4: None of the above
Answer: Distinct

Explaination: DISTINCT - Specifies that only unique rows can appear in the result set. Null values are considered equal for the purposes of the DISTINCT keyword.
Link: External Explaination

Correctly answered: 32578
Incorrectly answered: 8029
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