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OK I think I got what the problem was looking for from the explanation.
What confused me was this part of problem: "Write a query to print total number of unique hackers who made at least 1 submission each day (starting on the first day of the contest)". It made me think it meant each day of the contest. If it stated "(starting on the first day of the contest to the submission_date)" it would be more clear.
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15 Days of Learning SQL
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OK I think I got what the problem was looking for from the explanation. What confused me was this part of problem: "Write a query to print total number of unique hackers who made at least 1 submission each day (starting on the first day of the contest)". It made me think it meant each day of the contest. If it stated "(starting on the first day of the contest to the submission_date)" it would be more clear.