Substr with long datatype

Question

i try to use the substr function with the long datatype but it gave me error ora-00932 inconsistant datatypes...........

Answer 1

i had saw u r given link and try that example also but it gave me the same ora-06502
declare
text_c1 varchar2(32767);
sql_cur varchar2(2000);
begin
sql_cur := 'select '||'text'||' from
'||'alpine'||'.'||'letters'||' where letter_id =
'||chr(39)||7||chr(39);
dbms_output.put_line (sql_cur);
execute immediate sql_cur into text_c1;
text_c1 := substr(text_c1, 1, 4000);
--RETURN ;                                      
dbms_output.put_line (TEXT_C1);
END;