text: select
                 SUM(
                     CASE    WHEN j2.c_integer IS NULL THEN 0
                             WHEN j2.c_integer >= 0 THEN j2.c_integer*1.2 + 100
                             WHEN j2.c_integer < 0 THEN j2.c_integer
                     END
                     )
  from
          j2 FULL OUTER JOIN j1 ON
          (j1.c_integer = j2.c_integer)
             FULL OUTER JOIN j3 ON
          (j1.c_integer = j3.c_integer)
             FULL OUTER JOIN j4 ON
          (j1.c_integer = j4.c_integer)
  where
          j1.c_integer IS NOT NULL
  ;
  