-- 処理1(B300をA100のデータを利用して作成する)
INSERT INTO DEPARTMENT SELECT 'B300', 
            '2023-04-01', 
            END_DATE, 
            '新設部門', 
            LAYER, 
            UP_DEPT_CODE, 
            VALID_FLG, 
            UPDATE_USER_NAME,
            '2023-04-01 00:00:00'
    FROM DEPARTMENT WHERE DEPT_CODE = 'A100';

-- 処理2 統合される部門('A100','A200')を無効化
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 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 IN ('A100', 'A200');