20. Percent of Category Total
MediumWindow FunctionsSUM() OVER PARTITION BYratio to group total
A PARTITION BY window aggregate gives each row a group total
without a GROUP BY — perfect for "share of total" calculations.
Task: for each product return product, category, and pct — its
revenue as a percentage of its category's total revenue. Round to 1 decimal.
Order by category, then product.
Tables
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Expected outputrows must come back in this order
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