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This is more of an exercise about aggregations than joins
You have to create multiple aggregations, SUM the different values grouped by contest, convert null values into zero (for the where clause) and be careful about duplication (the only part where I can see join is actually an important thing here)
I believe this exercise should be in a different domain.
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This is more of an exercise about aggregations than joins
You have to create multiple aggregations, SUM the different values grouped by contest, convert null values into zero (for the where clause) and be careful about duplication (the only part where I can see
join
is actually an important thing here)I believe this exercise should be in a different domain.