如何得到包括标点符号（'）的长度？

Question

如何获得包含标点符号 ' 的长度？ 示例： -

SELECT LENGTH('A','B','C','D','E','F','G','H','I') FROM dual

Answer 1

SELECT '''A'',''B'',''C'',''D'',''E'',''F'',''G'',''H'',''I''' FROM DUAL;
-- 'A','B','C','D','E','F','G','H','I'

SELECT LENGTH('''A'',''B'',''C'',''D'',''E'',''F'',''G'',''H'',''I''') FROM DUAL;
-- 35

OR

DECLARE
    l_str VARCHAR2(100) := q'['A','B','C','D','E','F','G','H','I']';
BEGIN
    DBMS_OUTPUT.PUT_LINE(LENGTH(l_str));
END;
-- 35