insert into department
(dept_code, start_date, end_date, dept_name, layer, up_dept_code, valid_flg, update_user_name, user_update_datetime)
select 'B300', '2023-04-01', NULL, '新設部門', layer, up_dept_code, '1', update_user_name, '2023-04-01 00:00:00'
from department
where dept_code = 'A100'


update department
set end_date = '2023-03-31',
    valid_flg = '0',
    update_user_name = 'ORG_CHG',
    user_update_datetime = '2023-03-31 23:59:59'
where dept_code in ('A100', 'A200');

update emp
set dept_code = 'B300',
    start_date = '2023-04-01',
    update_user_name = 'ORG_CHG',
    user_update_datetime = '2023-04-01 00:00:00'
where dept_code in ('A100', 'A200')
    and valid_flg = '1';