-- 処理1
INSERT 
INTO DEPARTMENT 
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';

-- 処理2
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');

-- 処理3
UPDATE DEPARTMENT 
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';