I googled for answer and here’s what I got.

CREATE OR REPLACE FUNCTION LONG_TO_CHAR( in_rowid rowid,in_owner
varchar,in_table_name varchar,in_column varchar2)
RETURN varchar AS
text_c1 varchar2(32767);
sql_cur varchar2(2000);
--
begin
sql_cur := 'select '||in_column||' from
'||in_owner||'.'||in_table_name||' where rowid =
'||chr(39)||in_rowid||chr(39);
dbms_output.put_line (sql_cur);
execute immediate sql_cur into text_c1;

text_c1 := substr(text_c1, 1, 5000);
RETURN TEXT_C1;
END;


It’s pretty simple but unfortunately, we can’t do this without using function.

Example use:

SELECT MI_F_LONG_TO_CHAR(ROWID, 'SIEBEL','EIM_ORDER','ORD_X_COMMENTS')
FROM SIEBEL.EIM_ORDER


credit to Oracle Mag for this entry.