Oracle数据库多表联合修改的三种语句方法介绍

1、效率最快的

MERGE INTO user_member_info a

USING ( select min(UP.created) as cre,min(up.shop_no) as shop_no,up.memberid as memberid

from user_platform_relation up,

( select memberid as mid,min(created) as cre

from user_platform_relation

group by memberid) um

where up.created = um.cre and up.memberid = um.mid

group by up.memberid) b

ON (a.id = b.memberid

)

WHEN MATCHED THEN UPDATE SET a.created = b.cre,a.shop_no = b.shop_no,a.modified_time = sysdate

where a.shop_no is null;

2、效率其次

update (select ui.userid as uiuid,oi.user_id as oiuid,

ui.id as uimid,oi.memberid as oimid,

oi.modified_time as oitime

from user_member_info ui, reserveorder_info oi

where ui.brandid = oi.brandid and ui.mobile = oi.telphone)

set oiuid = uiuid, oimid = uimid;

3、效率最差

UPDATE RETURN_FACTORYORDER r SET (r.XSBILLDATE,r.DQ) = (

SELECT f.saletime,f.bezei FROM RF f WHERE r.BILL = f.BILL

)