Question : How do I perform a calculation in an update query?

I need to perform a query that first calculates the total weight for a category. There are not a set number of categories. Then I need to take the total weight for each category and update the weights withing that category by dividing the current value by the sum. Any help is appreciated on this.
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UPDATE Testing SET weight = weight/b.weight
FROM Testing a
	inner join
	(
		SELECT SUM(weight) as 'weight' FROM Testing GROUP BY category

	) b on a.Category = b.Category
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Answer : How do I perform a calculation in an update query?

Hello nisupport,

UPDATE a
SET a.weight = a.weight/b.weight
FROM Testing a
inner join
(
        SELECT Category, SUM(weight) as 'weight' FROM Testing GROUP BY category
) b on a.Category = b.Category




Regards,

aneeshattingal
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