Small query not compiling

Question

I did convert this from sql server query. it is getting stuck on "AND (OEN.DATEONLY(N.CREATED_ON) BETWEEN OEN.DATEONLY(DATEFROM) AND OEN.DATEONLY(DATETHRU))"
this error: PL/SQL: ORA-00904 "GEN"."DATEONLY" invalid identifier.
CREATE OR REPLACE PROCEDURE OEN.DBD_NOT_GET_NOTES_DETAIL (
FACILITYKEY varchar2
, DATEFROM DATE
, DATETHRU DATE
, UNITSTR varchar2
, NOTETYPE NUMERIC
, OCURSOR OUT SYS_REFCURSOR
) as
BEGIN
OPEN OCURSOR FOR
SELECT P.FACILITY_KEY,
P.PAT_NUMBER,
P.PATIENT_ID,
OEN.DATEONLY(N.CREATED_ON) CREATED_ON, N.NOTE_HEADER,
N.CREATED_BY, P.LAST_NAME, P.FIRST_NAME, P.MIDDLE_NAME, P.UNIT_CODE
FROM OEN.GEN_M_PATIENT_MAST P
INNER JOIN OTC.NOT_M_MAST N ON (P.PAT_NUMBER = N.PAT_NUMBER AND N.FACILITY_KEY = FACILITYKEY)
WHERE N.NOTE_STATUS = 0
AND (OEN.DATEONLY(N.CREATED_ON) BETWEEN OEN.DATEONLY(DATEFROM) AND OEN.DATEONLY(DATETHRU))
AND CREATED_ON BETWEEN DATEFROM AND DATETHRU
AND (UNITSTR IS NULL OR P.UNIT_CODE = UNITSTR);
END;

Answer 1

Hello
There is no DATEONLY function in Oracle. It seems that it is a user defined function which needs to be ported to Oracle. Alternatively you can simply use the TRUNC() function on the date column to just return the DATE portion of the DATE+TIME column.
So your query may look like TRUN(N.CREATED_ON) BETWEEN TRUNC(DATEFROM) AND TRUNC(DATETHRU)) assuming that CREATED_ON , DATEFROM, DATETHRU are of DATE datatypes in Oracle.
Regards
Prakash