Я хочу перенести приведенный ниже код SQL с MS SQL-Server на PostgreSQL.

DECLARE @iStartYear integer
DECLARE @iStartMonth integer

DECLARE @iEndYear integer
DECLARE @iEndMonth integer

SET @iStartYear = 2012
SET @iStartMonth = 4

SET @iEndYear = 2016
SET @iEndMonth = 1


;WITH CTE 
AS
(
    SELECT 
         --@iStartYear AS TheStartYear 
         @iStartMonth AS TheRunningMonth 
        ,@iStartYear AS TheYear  
        ,@iStartMonth AS TheMonth 

    UNION ALL 

    SELECT 
         --CTE.TheStartYear AS TheStartYear 
         --@iStartYear AS TheStartYear 
         CTE.TheRunningMonth + 1 AS TheRunningMonth 
         --,CTE.TheStartYear + (CTE.TheRunningMonth / 12) AS TheYear 
        ,@iStartYear + (CTE.TheRunningMonth / 12) AS TheYear 
        ,(CTE.TheMonth + 1 -1) % 12 + 1 AS TheMonth
    FROM CTE 
    WHERE (1=1) 

    AND
    (
        CASE 
            --WHEN (CTE.TheStartYear + (CTE.TheRunningMonth / 12) ) < @iEndYear 
            WHEN (@iStartYear + (CTE.TheRunningMonth / 12) ) < @iEndYear 
                THEN 1 
            --WHEN (CTE.TheStartYear + (CTE.TheRunningMonth / 12) ) = @iEndYear 
            WHEN (@iStartYear + (CTE.TheRunningMonth / 12) ) = @iEndYear 
                THEN 
                    CASE 
                        WHEN ( (CTE.TheMonth + 1 -1) % 12 + 1 )