CREATE TABLE IF NOT EXISTS tbl_code_item_20210301 SELECT * FROM tbl_code_item;

insert into tbl_code_item (title, order_no, cg_cd, val_1, ci_explain, ci_link, reg_dt, sys_member_id) 
select title, order_no, cg_cd, val_1, ci_explain, ci_link, now(), sys_member_id from tbl_code_item_20210301