--処理1
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'
    ,DE.LAYER
    ,DE.UP_DEPT_CODE
    ,'1'
    ,DE.UPDATE_USER_NAME
    ,'2023-04-01 00:00:00'
FROM DEPARTMENT DE
WHERE DE.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 = 'A100'
AND DEPT_CODE = 'A200';

--処理３
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 VALID_FLG = '1'
AND DEPT_CODE ='A100'
OR DEPT_CODE ='A200';