I am trying to categorise my site points by species group with rule based symbology;
e.g. bat uses the formula
But I would also like to have a different symbol for where there are no bats recorded at that site (i.e. based on the abundance in a separate column which is taken from a join with another table). I have tried this below but it hasn't worked, does anyone know how to fix this?
"Group"='Bat' AND "records_Abundance" = '<= 0' (for sites where species not present)
"Group"='Bat' AND "records_Abundance" = '>= 1' (for sites where species are present)
It seems to only read the abundance part and either turns all my points for all species to the symbol or none at all?