Count Distinct - it's counting blanks
Hi - I'm using COUNT (DISTINCT to get a unique count of ID numbers and there are some records where the ID number is intentionally blank. I want these records to be excluded from the count entirely but this function seems to be counting 'blank' as its own unique value and is therefore adding 1 to the unique count which is throwing everything off. How can I exclude blanks from this count?
Answers
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I'm assuming you are doing this at the card level. You can do this a couple different ways.
- If you don't need the blank records, drag the ID field into the filter section and tell it to exclude blank records. Then, your count distinct should work as is.
- If you need the blanks but don't want to count them you can write a beast mode like this:
SUM(CASE WHEN TRIM(ID) = '' OR ID IS NULL THEN 0 ELSE 1 END)
Hope this helps.
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@MarkSnodgrass is pointing out that an empty string, '' <> NULL. hence his test:
TRIM(ID) = '' or ID is null
HOWEVER, SUM ... 1 else 0 END will give you COUNT not COUNT (DISTINCT).
@ekola ,
you should validate whether COUNT DISTINCT is including NULLS or not, because standard behavior in many SQL implementations is to IGNORE NULLS with COUNT DISTINCT. But again... NULL <> ''
Jae Wilson
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