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Why do we even need to use GROUP BY in the above code. I know that it will give an error but I'm still confused as to why group by is used. Plus wont count(s.hacker_id) count those submissions which have not received full marks also...
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Why do we even need to use GROUP BY in the above code. I know that it will give an error but I'm still confused as to why group by is used. Plus wont count(s.hacker_id) count those submissions which have not received full marks also...