SELECT y12.MONTH,
       y12.year_2011,
       y12.year_2012,
       y3.year_2013
FROM
    (SELECT y1.MONTH,
           y1.year_2011,
           y2.year_2012
    FROM
        (SELECT EXTRACT(MONTH FROM CAST(invoice_date AS TIMESTAMP)) AS MONTH,
               COUNT(total) AS year_2011

        FROM invoice
        WHERE EXTRACT(YEAR FROM CAST(invoice_date AS TIMESTAMP)) IN (2011)
        GROUP BY EXTRACT(MONTH FROM CAST(invoice_date AS TIMESTAMP))) AS y1
    LEFT OUTER JOIN
        (SELECT EXTRACT(MONTH FROM CAST(invoice_date AS TIMESTAMP)) AS MONTH,
               COUNT(total) AS year_2012

        FROM invoice
        WHERE EXTRACT(YEAR FROM CAST(invoice_date AS TIMESTAMP)) IN (2012)
        GROUP BY EXTRACT(MONTH FROM CAST(invoice_date AS TIMESTAMP))) AS y2 ON y1.MONTH = y2.MONTH) AS y12
LEFT OUTER JOIN
    (SELECT EXTRACT(MONTH FROM CAST(invoice_date AS TIMESTAMP)) AS MONTH,
               COUNT(total) AS year_2013

        FROM invoice
        WHERE EXTRACT(YEAR FROM CAST(invoice_date AS TIMESTAMP)) IN (2013)
        GROUP BY EXTRACT(MONTH FROM CAST(invoice_date AS TIMESTAMP))) AS y3 ON y12.MONTH = y3.MONTH