I have no idea how this works.
-Edit-
I believe I understand the scripting, well enough.
How do I put this into effect on the server?
I get this error:
: DB error - Table 'rathena_prere_db.e_jobchanger' doesn't exist
[Debug]: at d:\downloads\idm\ragnarok online offline pack rathena 2018\ragnarok
online offline pack rathena 2018\01_emulator\01_emulator\rathena_prere\src\map\s
cript.cpp:16671 - SELECT `next_job`,`base_lv`,`job_lv`,`bonus_stpoint`,`bonus_sk
point`,`resetlvl`,`req_zeny` FROM `e_jobchanger` WHERE `status` = 1 AND `job` =
9 LIMIT 100
[Debug]: Source (NPC): sql_job_changer_main (invisible/not on a map)