update CONFIG t set (t.config_value,t.last_update)=(select 'tom',sysdate from dual) where t.id=2;
-- commit;
-- select 'tom',sysdate from dual
oracle 同時更新（update）多個字段多個值
http://blog.csdn.net/bbqk9/article/details/5890892/
--創建表A,B：
create table A (a1 varchar2(33),a2 varchar2(33),a3 varchar2(33));
create table B (b1 varchar2(33),b2 varchar2(33),b3 varchar2(33));
--插入數據
insert into A values('1','aa','100');
insert into A values('2','bb','100');
insert into A values('3','cc','');
insert into A values('4','dd','200');
insert into B values('1','XX','10000');
insert into B values('2','YY','10000');
insert into B values('4','ZZ','20000');
insert into B values('5','KK','');
commit;
--更新前的表A,B：
--對表A的a2，a3進行更新（帶條件）；
update A
set (A.a2,A.a3) =(select B.b2,b.b3
from B
where B.b1= A.a1 and A.a3=100
)
where exists
(select 'X' from B where B.b1=A.a1 and A.a3=100) ;
commit;
--或者：
update A
set (A.a2,A.a3 )=
(select B.b2,b.b3
from B
where B.b1= A.a1 and A.a3=100
)
where (A.a1) in (select B.b1 from B
where B.b1 = A.a1
and A.a3 =100 );
commit;
--更新后的表A：
