紧急求助，update select语句的问题

是这样的，我已经使用select 连接多表取得想要更新的记录集，共有139条记录，FAssGrpID值都是'ZZW0XxLMQjqiyV/6c9PO2kGKbLs='
现在想在这查出的139条记录中更新 FAssGrpID值为其它值，应该怎么写语句呢？？求助呀~~


SQL code

select tgv.fid,tgv.fbookeddate,tgv.fnumber,tgve.flocalamount,tgve.fid,tgve.faccountid,tgvar.fid,tgvar.fentryid,tgvar.fassgrpid,tgvar.fbillid  from T_GL_VoucherAssistRecord tgvar, T_GL_Voucher tgv,T_GL_VoucherEntry tgve where tgvar.FAssGrpID='ZZW0XxLMQjqiyV/6c9PO2kGKbLs=' 
and tgvar.fbillid=tgv.fid and tgv.fcompanyid='X6LYi/UfSGuuUA9ZNwxJasznrtQ='
and tgvar.fentryid=tgve.fid and tgve.faccountid='TIwPYRKyRUy4gNse9h1Z+p2pmCY=' order by fbookeddate

SQL code

update T_GL_VoucherAssistRecord
set fassgrpid=你要更新的值
from T_GL_VoucherAssistRecord tgvar, T_GL_Voucher tgv,T_GL_VoucherEntry tgve where tgvar.FAssGrpID='ZZW0XxLMQjqiyV/6c9PO2kGKbLs=' 
and tgvar.fbillid=tgv.fid and tgv.fcompanyid='X6LYi/UfSGuuUA9ZNwxJasznrtQ='
and tgvar.fentryid=tgve.fid and tgve.faccountid='TIwPYRKyRUy4gNse9h1Z+p2pmCY=' 

SQL code

update tgv set faccountid=其他值 from T_GL_VoucherAssistRecord tgvar, T_GL_Voucher tgv,T_GL_VoucherEntry tgve where tgvar.FAssGrpID='ZZW0XxLMQjqiyV/6c9PO2kGKbLs=' 
and tgvar.fbillid=tgv.fid and tgv.fcompanyid='X6LYi/UfSGuuUA9ZNwxJasznrtQ='
and tgvar.fentryid=tgve.fid and tgve.faccountid='TIwPYRKyRUy4gNse9h1Z+p2pmCY='

SQL code

update
 tgv 
set
 faccountid=其他值 
from
 T_GL_VoucherAssistRecord tgvar, T_GL_Voucher tgv,T_GL_VoucherEntry tgve 
where
 tgvar.FAssGrpID='ZZW0XxLMQjqiyV/6c9PO2kGKbLs=' 
and
 tgvar.fbillid=tgv.fid and tgv.fcompanyid='X6LYi/UfSGuuUA9ZNwxJasznrtQ='
and
 tgvar.fentryid=tgve.fid and tgve.faccountid='TIwPYRKyRUy4gNse9h1Z+p2pmCY='