Oracle笔记 四、增删改、事务

 

1、插入
    insert into dept values(50, 'soft', 'Guangzhou');
    insert into dept(deptno, dname) values(60, 'software test');
    insert into dept select * from dept where deptno = 20;
 
2、删除
    delete from dept where deptno = 20;
    delete from dept;
 
3、修改
    update dept set dname = dname || ' ^.^' where deptno = 20;
 
4、事务
    每个修改语句完成后都可以回滚或提交,即rollback、commit;
    eg:
    insert into dept values(50, 'soft', 'Guangzhou');
    rollback;
    这样就回滚了,等于上面的没有插入;如果commit就提交了,此后如果再rollback也无力回天了。
    下面这样也是无法回滚的:
    insert into dept values(50, 'soft', 'Guangzhou');
    create table temp as select * from dept;
    rollback;
    再次查询,发现无法回滚;同样增删改后面运行grant/create语句也是无法回滚的;

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