根据一张表更新另一张表

update tablea a, tableb b set a.bname=b.name where a.bid=b.id and a.id between 262 and 271
update tablea a inner join tableb b on a.bid=b.id set a.bname=b.name where a.id between 262 and 271  --between 是>= and <=，即包含两个边界
--有查询的
update a set a.num = a.num + b.num
from table1 a inner join (select * from b1) b on a.id = b.id --(关联条件)
where ...   
update mf_bus p,(
  select pact_no,pact_amt,sum(putout_amt) as putout_amt from mf_app group by pact_no
) b
set p.usable_finc_amt = b.pact_amt - b.putout_amt  
where p.pact_no = b.pact_no

UPDATE A a SET (a.A1, a.A2, a.A3) = (
  SELECT b.B1, b.B2, b.B3 FROM B b WHERE a.ID = b.ID
) 
WHERE a.ID IN (SELECT B.ID FROM B WHERE A.ID = B.ID)