select chr(92)||chr(102) from dual; f
select chr(92)||chr(110) from dual;
select chr(92)||chr(114) from dual;
select chr(92)||chr(116) from dual;
select chr(92)||chr(118) from dual; v
退格符(Backspace) 0x08
f 换页符(Form Feed) 0x0c
换行符(Line Feed) 0x0a
回车符(Carriage Return) 0x0d
水平制表符(Horizontal Tab) 0x09
v 垂直制表符(Vertical Tab) 0x0b
char(13) 回车
char(10) 换行