如何备份Oracle数据库：
MD F:\DB_BAK\%date:~0,10%
EXP userid=bszlhr/bszlhr@ORCL_14 file=F:\DB_BAK\%date:~0,10%\bszlhr%date:~0,10%.dmp log=f:\DB_BAK\%date:~0,10%\log_bszlhr_%date:~0,10%.log
buffer=64000 owner=bszlhr
-----创建信用信息的表----------
create table GCCredit(
itemID number(10,0),
EmpID number(10,0),
CreditCots varchar2(100),
Notes varchar(100)
)
select * from GCCredit
GCV_Credit
-------创建信用信息的视图------
CREATE OR REPLACE VIEW GCV_Credit (
filepath,
unitid,
deptno,
empno,
empname,
position,
itemid,
empid,
creditcots,
notes
)
AS
Select emp.FilePath ,emp.UnitID, emp.DeptNo, emp.EmpNo, emp.EmpName,emp.position,
c.itemid,c.empid,c.creditcots,c.notes
from GCCredit c, GCEmployee emp
WHERE emp.EmpID = c.EmpID
select * from GCV_Credit
----1.用来查询所需要的应用程序------------------
select * from gc_appobjects where obj_class like '%Credit%';
-----2.用来查询所需要的数据对象-----------------
select * from gc_dbobjects where obj_class like '%Credit%';
------3.用来查询数据对象中所包含的字段--------
select * from gc_columns where obj_id in (
select obj_id from gc_dbobjects where obj_class like '%Credit%');
1. 在oracle中如何获取前10条的记录：
select * from tablename where rownum<11 order by colname desc
2. 在oracle中的多表连接查询，
Oracle多表连接与子查询
Posted on 2009-07-02 13:17 仲宏伟（anmo） 阅读(456) 评论(0) 编辑 收藏
1：等值连接
迪卡尔集连接
select ename, a.deptno as a_deptno,b.deptno as b_deptno ,b.dn
