--A100を参考にB300のレコードを作成
INSERT INTO
    DEPARTMENT
SELECT
    'B300'
    ,'2023-04-01'
    ,NULL
    ,'新設部門'
    ,D.LAYER
    ,D.UP_DEPT_CODE
    ,'1'
    ,D.UPDATE_USER_NAME
    ,'2023-04-01 00:00:00'
FROM
    DEPARTMENT AS D
WHERE
    D.DEPT_CODE = 'A100';
    
--SELECT * FROM DEPARTMENT WHERE DEPT_CODE = 'B300';
--A100,A200を無効化処理
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');
--SELECT * FROM DEPARTMENT;
--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
    DEPT_CODE IN ('A100', 'A200')
    AND VALID_FLG = '1';
    
--SELECT * FROM EMP;