The DAL doesn't support exists yet, which is kind of bad because count is quite less efficient than exists when all you want is to know if there is anything there. I would file a ticket in the pydal repository and ask for exists support even Table.isempty doesn't use exists. Which I see you already did, https://github.com/web2py/pydal/issues/447 lets see if someone picks it up otherwise you may have to be the one doing it :) Meanwhile if you really needs exists you need to use executesql
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