You can reduce this to a single query by filtering the groups returned by GROUP BY with a HAVING clause, i.e.
SELECT project_id, chart_id, SUM(amount)
        FROM ($sql) self
       GROUP BY project_id, chart_id
       HAVING SUM(amount) != 0

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In reply to Re: DBIx::Class Query Help by anonymized user 468275
in thread DBIx::Class Query Help by duelafn

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