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Last tested; May 12, 2020
<=0 OR >0 OR NULL
for numbers, %,NULL
for strings.
To get all non-null values, see How do I filter out null in a filtered measure?
Here are expressions that DON'T work:
NULL, NOT NULL
for numbers and NULL,-NULL
for strings generate AND between the two parts, so no values will be returned. NULL OR NOT NULL
cannot be parsed as a filter expression.
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