Oracle self-increment cannot start with 1

problem description

I want the XH field to increase from 1, because it is of varchar type, so I use this way, but I find that the XH field in my data table starts to increase from 217, why

the environmental background of the problems and what methods you have tried

related codes

/ / Please paste the code text below (please do not replace the code with pictures)
declare
j number;
I number;
begin
iVl1;
for i in 1.. 3040000 loop
insert into g_jdcl (XH, HPZL, HPHM, CLXH, CLLX, CSYS, CLPP1) values (to_char (j),"01 Leng Leng "Yue A" | dbms_random.string

IF Mod(j,5000)=0 
THEN 
   COMMIT; 
   dbms_output.put_line("over!");
END IF; 

end loop;

end;

I want the XH field to increase from 1, because it is of varchar type, so I use this way, but I find that the XH field in my data table starts to increase from 217, why

what result do you expect? What is the error message actually seen?

Nov.27,2021

look at the code and take a look at the data in the order of the xh field:

SELECT * FROM g_jdcl
order by to_number(xh)
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e48a4d-44cc2.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e48a4d-44cc2.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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