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Could you please explain why you used 'group by' in s1? Why cannot I replace last three line to 'from submissions s1', and add 'distinct' in the first line? Thank you.
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15 Days of Learning SQL
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Could you please explain why you used 'group by' in s1? Why cannot I replace last three line to 'from submissions s1', and add 'distinct' in the first line? Thank you.