[Rails] mysql syntax error when trying to capture cumulative sum

[John Merlino]

Hey all,

I've searched the web and cannot find an example of getting a cumulative
count by month for a specific object using Rails, and then displaying
that in an array. This gives a mysql syntax error:

    count = Student.count("SELECT
        x1.MonthNo
      , x1.MonthName
      , x1.Added
      , SUM(x2.Added) AS RunningTotal
      FROM
      (
      SELECT
        MONTH(passed_on) AS MonthNo
      , MONTHNAME(passed_on) AS MonthName
      , COUNT(*) AS Added
      FROM students
      WHERE passed_on >= '2009-09-23'
      GROUP BY MONTH(passed_on)
      ) AS x1
      INNER JOIN (
      SELECT
        MONTH(passed_on) AS MonthNo
      , MONTHNAME(passed_on) AS MonthName
      , COUNT(*) AS Added
      FROM students
      WHERE passed_on >= '2009-09-23'
      GROUP BY MONTH(passed_on)
      ) AS x2
      ON x1.MonthNo >= x2.MonthNo
      GROUP BY x1.MonthNo;")

def panels
                  :series => [{
                      :name => 'Passed',
                      :data => count
                  }
end

The idea is to show the cumulative sum over several months which will be
displayed in a chart. Thanks for any response.
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