with
    a as
    (
        select
            LAYER as l
            ,UP_DEPT_CODE as udcd
            ,UPDATE_USER_NAME as uun
        from
            DEPARTMENT
        where
            DEPT_CODE = 'A100'
    )
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'
    ,LAYER
    ,UP_DEPT_CODE
    ,'1'
    ,UPDATE_USER_NAME
    ,'2023-04-01 00:00:00'
from
    DEPARTMENT
where
    DEPT_CODE = 'A100'
;

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')
;