Oracle使用查询结果更新表的方法

模拟实验如下,使用t2表的查询结果，更新t1表相同id的数据。

drop table t1;

drop table t2;

create table t1(id int primary key,nickname varchar(20),playNum varchar(20));

create table t2(id int primary key,nickname varchar(20),playNum varchar(20));

insert into t1 values(1,1,10);

insert into t1 values(2,2,20);

insert into t1 values(3,3,30);

insert into t2 values(1,11,100);

insert into t2 values(2,22,200);

insert into t2 values(3,33,300);

commit;

Oracle有两种方式:
内联视图更新

update (

select t1.id t1id ,t1.nickname t1nickname,t1.playNum t1playnum,t2.id t2id ,t2.nickname t2nickname,t2.playNum t2playnum

from t1 inner join t2 on (t1.id=t2.id)

)

set t1nickname=t2nickname,t1playnum=t2playnum;

相关子查询

update t1 set (nickname,playNum)=

(select nickname,playNum from t2 where t1.id=t2.id);

MySQL只有下面的这一种方式
不过可以同时修改两个表的数据.
用t2的playNum更新t1,用t1的nickname更新t2

update t1,t2

set t2.nickname=t1.nickname,t1.playNum=t2.playNum

where t1.id=t2.id;

MySQL和Oracle的方式互不通用。