How to aggregate CASE Statement values?
In my dataset, I have three different tests that aggregate the field Forecast
differently. Here's a beast mode I made that works pretty well, except when I'm trying to add them all together:
CASE
WHEN Test
= 1 THEN SUM (Forecast
)
WHEN Test
= 2 THEN SUM (DISTINCT Forecast
)
WHEN Test
= 3 THEN SUM (DISTINCT Forecast
)
END
when I filter by each Test
, it works great. But when I want all of them selected, it doesn't work at all; just defaults to one value.
Example:
Test 1 Forecast: 100
Test 2 Forecast: 350
Test 3 Forecast: 250
If I select all tests, the total should be 700. If I select Tests 1 + 2, it should be 450 and so on. However, it doesn't add these together at all. How can I do this?
Comments

change your logic a bit so that you’re adding your different sums together since you want to add all the sums together based on your filters .
SUM(CASE WHEN test = 1 THEN forecast ELSE 0 END) + SUM(DISTINCT CASE WHEN test = 2 THEN forecast ELSE 0 END) + SUM(DISTINCT CASE WHEN test = 3 THEN forecast ELSE 0 END)
Sorry for the bad formatting. I’m on mobile and on vacation :)
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awesome, that solves my problem perfectly! Thank you so much Grant!
0 
don't use SUM(Distinct) that's too risky.
Imagine if the forecast value for a set of employees is all 50. SUM distinct would assume there was only one employee with a forecast value of 50.
The better solution is to reshape your data such that you don't have to rely on DISTINCT to deduplicate rows. have a set of rows for the employee forecast, have a second set of rows for the regional forecast and a third set of rows for the state forecast. or however you're rolling up your forecasts.
Jae Wilson
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