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I tried to filter my spatialite layer with the

"SPECIES" IS NOT NULL OR "SPECIES" != 'Corvus corax'

expression, but the result contains the lines where "FAJ" field is 'Corvus corax' (the NULL value withered correctly).

What's wrong with this expression? How can I filter all of the rows where "SPECIES" field is not null or not equal to Corvus corax?

1 Answer 1

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Try:

   "SPECIES" IS NOT NULL AND "SPECIES" != 'Corvus corax'

AND instead of the OR

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