ORA-01741 and ORA-01704

reason

ORA-01741: Illegal zero length identifier
ORA-01704: The string text is too long
oralce Of clob Caused by too long field

solve

sql Just write the following sentence

declare
a_clob clob:=TO_CLOB('1111')||TO_CLOB('22222');
begin
insert into  surface (clob Field ) values (a_clob);
end;

Knowledge points used

1. || Concatenate characters
2. TO_CLOB function
3. Define variables first