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'
;