The only thing you need to change is the code "around" the function. Oracle uses a different "header" than Postgres.
So the function in PL/SQL would look like this. I only changed the beginning CREATE OR REPLACE and the part after the final END
.
CREATE OR REPLACE FUNCTION fngetstatus(iactdate varchar, ideactdate varchar)
RETURN varchar
AS
returnval VARCHAR (1);
BEGIN
IF TO_DATE (iactdate, 'mm/dd/yyyy') >
TO_DATE (TO_CHAR (SYSDATE, 'mm/dd/yyyy'), 'mm/dd/yyyy')
AND TO_DATE (ideactdate, 'mm/dd/yyyy') >
TO_DATE (TO_CHAR (SYSDATE, 'mm/dd/yyyy'), 'mm/dd/yyyy')
THEN
returnval := 'D';
ELSIF TO_DATE (iactdate, 'mm/dd/yyyy') >
TO_DATE (TO_CHAR (SYSDATE, 'mm/dd/yyyy'), 'mm/dd/yyyy')
AND TO_DATE (ideactdate, 'mm/dd/yyyy') IS NULL
THEN
returnval := 'D';
ELSIF TO_DATE (iactdate, 'mm/dd/yyyy') <=
TO_DATE (TO_CHAR (SYSDATE, 'mm/dd/yyyy'), 'mm/dd/yyyy')
AND TO_DATE (ideactdate, 'mm/dd/yyyy') >
TO_DATE (TO_CHAR (SYSDATE, 'mm/dd/yyyy'), 'mm/dd/yyyy')
THEN
returnval := 'A';
ELSIF TO_DATE (iactdate, 'mm/dd/yyyy') <=
TO_DATE (TO_CHAR (SYSDATE, 'mm/dd/yyyy'), 'mm/dd/yyyy')
AND TO_DATE (ideactdate, 'mm/dd/yyyy') IS NULL
THEN
returnval := 'A';
ELSIF TO_DATE (iactdate, 'mm/dd/yyyy') <
TO_DATE (TO_CHAR (SYSDATE, 'mm/dd/yyyy'), 'mm/dd/yyyy')
AND TO_DATE (ideactdate, 'mm/dd/yyyy') <=
TO_DATE (TO_CHAR (SYSDATE, 'mm/dd/yyyy'), 'mm/dd/yyyy')
THEN
returnval := 'D';
ELSIF TO_DATE (iactdate, 'mm/dd/yyyy') =
TO_DATE (TO_CHAR (SYSDATE, 'mm/dd/yyyy'), 'mm/dd/yyyy')
AND TO_DATE (ideactdate, 'mm/dd/yyyy') =
TO_DATE (TO_CHAR (SYSDATE, 'mm/dd/yyyy'), 'mm/dd/yyyy')
THEN
returnval := 'D';
ELSIF TO_DATE (ideactdate, 'mm/dd/yyyy') >=
TO_DATE (TO_CHAR (SYSDATE, 'mm/dd/yyyy'), 'mm/dd/yyyy')
AND TO_DATE (iactdate, 'mm/dd/yyyy') is null
THEN
returnval := 'A';
ELSIF TO_DATE (iactdate, 'mm/dd/yyyy') <=
TO_DATE (TO_CHAR (SYSDATE, 'mm/dd/yyyy'), 'mm/dd/yyyy')
AND TO_DATE (ideactdate, 'mm/dd/yyyy') <
TO_DATE (TO_CHAR (SYSDATE, 'mm/dd/yyyy'), 'mm/dd/yyyy')
THEN
returnval := 'A';
ELSIF TO_DATE (iactdate, 'mm/dd/yyyy') >
TO_DATE (TO_CHAR (SYSDATE, 'mm/dd/yyyy'), 'mm/dd/yyyy')
AND TO_DATE (ideactdate, 'mm/dd/yyyy') <
TO_DATE (TO_CHAR (SYSDATE, 'mm/dd/yyyy'), 'mm/dd/yyyy')
THEN
returnval := 'D';
ELSIF TO_DATE (iactdate, 'mm/dd/yyyy') >
TO_DATE (TO_CHAR (SYSDATE, 'mm/dd/yyyy'), 'mm/dd/yyyy')
AND TO_DATE (ideactdate, 'mm/dd/yyyy') <=
TO_DATE (TO_CHAR (SYSDATE, 'mm/dd/yyyy'), 'mm/dd/yyyy')
THEN
returnval := 'D';
END IF;
RETURN returnval;
END;
/
Here is a SQLFiddle example: http://sqlfiddle.com/#!4/94990/2