表结构：
CREATE TABLE ATEST
(ID INTEGER,
NAME VARCHAR(256),
CODE INTEGER,
NAME2 VARCHAR(256)
)
CREATE TABLE BTEST
(ID INTEGER,
CODE INTEGER
)
CREATE TABLE CTEST
(ID INTEGER,
NAME VARCHAR(256),
NAME2 VARCHAR(256)
)
SQL语句：
一张表更新另一张表的字段：
update atest
set atest.name=(select ctest.name from ctest where atest.id = ctest.id)
where atest.id in (select ctest.id from ctest);
两张表关联更新另一张表的字段：
update atest
set (name,name2) = (SELECT CASE WHEN CTEST.NAME IS NULL THEN ATEST.NAME ELSE CTEST.NAME END, CASE WHEN CTEST.NAME2 IS NULL THEN ATEST.NAME2 ELSE CTEST.NAME2 END FROM BTEST LEFT JOIN CTEST on BTEST.ID = CTEST.ID WHERE atest.CODE = BTEST.CODE)
WHERE atest.CODE IN (SELECT BTEST.CODE FROM BTEST);
另外一个: http://blog.csdn.net/Bobwu/archive/2009/01/13/3768636.aspx
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)