WITH t AS (
    SELECT LAYER, UP_DEPT_CODE, UPDATE_USER_NAME FROM DEPARTMENT WHERE DEPT_CODE = 'A100'
)
INSERT INTO
    DEPARTMENT
SELECT
    'B300'
    , '2023-04-01'
    , NULL
    , '新設部門'
    , (SELECT LAYER FROM t)
    , (SELECT UP_DEPT_CODE FROM t)
    , '1'
    , (SELECT UPDATE_USER_NAME FROM t)
    , '2023-04-01 00:00:00'
;

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'
;