SELECT
  PoolMonth,
  SUM(OriginationAmt) AS Origination,
  SUM(IF(PmtDue = 201512, AmtPaid, 0)) AS `201512`,
  SUM(IF(PmtDue = 201601, AmtPaid, 0)) AS `201601`,
  SUM(IF(PmtDue = 201602, AmtPaid, 0)) AS `201602`
FROM
  Loans
GROUP BY
  PoolMonth;