Divide numbers from same column based on criteria from another column

I have the following dataset, and would like to create a DAU/MAU ratio for each day. I would want to create a beast mode that powers this number and can be used to generate a line chart at daily level.
Answers
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You can use a case statement for this
SUM(CASE WHEN `category` = 'DAU' THEN `users` END) / SUM(CASE WHEN `category` = 'MAU' THEN `users` END)
Then make sure to graph based on your date field. You can change the aggregation function if you need something different.
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Thanks @GrantSmith however, this will only give me a value when date is 30th Jan. How can I divide other dates with 30th Jan?
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When should the Jan 30th date be used? For All dates in January or just some of them?
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for every date of daily
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Any luck here @GrantSmith ?
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You can utilize a window function to pull the MAU for each month and divide your DAU by that number
MAX(CASE WHEN `category` = 'DAU' THEN `users` END) / MAX(MAX(CASE WHEN `category` = 'MAU' THEN `users` END) FIXED (BY LAST_DAY(`date`)))
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GrantSmith's suggestion should work fantastic. Another option is to restructure the data in an ETL. Add a column to the data set that is MAU instead of having it as a dedicated row in the data source. Either way will work, just depends on what technology you are most comfortable with.
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