with sub as (
    select
        'B300' as DEPT_CODE
        , '2023-04-01'as START_DATE
        ,NULL as END_DATE
        , '新設部門' as DEPT_NAME
        ,LAYER
        ,UP_DEPT_CODE
        , '1' as VALID_FLG
        ,UPDATE_USER_NAME
        ,'2023-04-01 00:00:00' as USER_UPDATE_DATETIME
    from DEPARTMENT
    where DEPT_CODE =  'A100'
    )
--処理1
insert into DEPARTMENT
select * from sub;
--select * from DEPARTMENT
--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 in ('A100','A200');
--処理3
update 
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';