Oracle根据一个表更新另一个表的几种写法

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)