1.

declare

cursor t1 is select * from tablename;

begin

for rec in t1 loop

update tablename t set t.detail=rec.jieshao where t.objectid=rec.objid;

end loop;

end;

2.

update   student   set   (name,id   )=

(select   name   ,id     from   (select   student.rowid   rd,student1.name,student1.id   from   student1,student   where   student1.int_id   =student.int_id)   tmp

where   student.rowid=tmp.rd);

commit;

3.

update test_a a set (a.name,a.age)=

(select b.name,b.age from test_b b where a.id = b.id) where exists

(select * from test_b c where c.id=a.id)

4.

UPDATE   t_A   SET   Djrq=

(

SELECT   djrq   FROM   t_B   WHERE   t_A.ID   =   T_B.ID

WHERE   ROWNUM   =   1

)

WHERE   t_A.ID   IN

(

SELECT   ID   FROM   t_B   WHERE   jwh='XX村'

)

5.

update tbl1 a

set (a.col1, a.col2) = (select b.col1, b.col2

from tbl2 b

where a.key = b.key)

where a.key in(select key from tbl2)