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I have a table of sites that has a field Priority with values 'P1', 'P2', 'P3'. I want to apply rule based labeling such that when a site has Priority = P1 it should be labelled with 'P1', when it has Priority =P2 it should be labelled with 'P2', etc.

I have tried the below formula in the filter under Rule Properties window: "Priority" = P1 but when I click test I get an error saying Column P1 not found.

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Under the "Filter" for rule based labeling write "Priority" = 'P1' (note the double brackets around the column, and the single brackets around the expected result). Single brackets are needed as the expression is searching for a string. The only time you don't need to use single brackets would be when searching for integers.

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There's no need to use rule-based labeling. To label each site with the value from the Priority field, turn on labeling and select the Priority field from the drop-down menu.enter image description here

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