Oracle操作语句

Oracle操作语句

建立表：

 创建一个简单的表

Create table test(

Name varchar2(16),

Age number(3), 

Birth date

);

insert 插入:
insert into emp
  values(8001,'java','clerk',7902,sysdate,1000,null,10);

update 修改:
update emp set ename='jack',job='clerk'(修改表中全部数据)
update emp set ename='jack',job='clerk'(修改指定记录)
  where empno=8000;

delete 删除:
delete from emp;(删除表中全部数据)
delete from emp wehre empno=8000;(删除指定记录)
delete from emp where empno>8000;

 

备份表
Merge语句
merge into emp_bak eb
 using(select * from emp) e
 on(eb.empno=e.empno)
   when matched then
   update set
          eb.ename=e.ename,eb.job=e.job;
   when not matched then
   insert(ename,job) balues(e.ename,e.job);

数据库的事物
COMMIT  提交
ROLLBACK 回滚

insert into emp(empno,ename) values(8002,'zhangsan');

insert into emp(empno,ename) values(8003,'zhangsan');
create table tt(ename varchar2(20));
insert into emp_bak(empno,ename) values(8002,'zhangsan');
rollback;
--emp表插入两条数据，emp_bak表没有插入数据

 

建立存储点
savepoint a;
回滚存储点
rollback to a;