易截截图软件、单文件、免安装、纯绿色、仅160KB

SQL语句PART11


1. My test: (create and grant the sysdba to a new user by SQL*Plus)
CREATE USER FJTEST1 IDENTIFIED BY JEANJEANFANG;
GRANT SYSDBA TO FJTEST;
REVOKE SYSDBA from FJTEST;
CONNECT FJTEST1/JEANJEANFANG AS SYSDBA;
2. Using ORAPWD in windows:
C:\» ORAPWD;
(show help information)
3. to see the password file:
Grammer: ORACLE_BASE\ORACLE_HOME\database» attrib
F:\oracle\ora92\database\attrib
** if want to create a user that can be connect as normal and can create table, you should grant “create session”, “resource” privileges to the user or it cannot connect as normal.
e.g.:
SQL»create user fj identified by fj;
SQL»grant create session to fj;
SQL»grant resource to fj;
Then the user “fj” can be connected as “normal” and the schema belonging to this user will be created, where he/she can create tables.
SQL» select * from user_sys_privs;
Use above statements to check user’s own system privileges.
2.How to create password file using ORAPWD
F:\oracle\ora92\database\ORAPWD FILE=F:\oracle=ora92\database\PWDmydb.ora PASSWORD=oracle ENTRIES=30
F:\oracle\ora92\database\sqlplus /nolog
SQL» connect SYS/oracle AS SYSDBA
ERROR: ORA-01031: insufficient privileges
(如果发生以上错误, 说明在ORACLE中开启了多于一个的数据库, 并且处于STARTUP状态.此时要连接必须用:  connect SYS/oracle@SID AS SYSDBA, 必须在F:\oracle\ora92\network\admin\TNSNAMES.ORA里面定义过, 如果连接的是个别数据库,就不会报告这样的错误)
TNSNAMES.ORA 定义方式:
FJDB.SIIC.COM =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = fangjin)(PORT = 1521))
)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = fjdb)
)
)
** or use the following command in dos state:
C: \ set oracle_sid = “jeandb”
C:\ sqlplus /nolog
SQL» connect sys/jeandb as sysdba;
3. How to create an oracle database in windows manually
Step1: setting environment var


相关文档:

(转)SQL经典面试题集(三)


第二十题:
怎么样抽取重复记录
表:
id name
--------
1 test1
2 test2
3 test3
4 test4
5 test5
6 test6
2 test2
3 test3
2 test2
6 test6
查出所有有重复记录的数据,用一句sql 来实现
create table D(
id varchar (20),
name varchar (20)
)
insert into D values('1','test1')
insert into D v ......

ORACLE PL/SQL 对象(object)学习笔记(二)

4、对象依赖性
 
CREATE OR REPLACE TYPE Obj1 AS OBJECT (
f1 NUMBER,
f2 VARCHAR2(10),
f3 DATE
);
/

CREATE OR REPLACE TYPE Obj2 AS OBJECT (
f1 DATE,
f2 CHAR(1)
);
/

CREATE OR REPLACE TYPE Obj3 AS OBJECT (
a Obj1,
b Obj2
);
/
  
 
OBJ3依赖于OBJ ......

SQL语句PART6

Differring Constraints:
Constraints can have the following attributes: DEFFERRABLE / NOT DEFFERRABLE,  INITIALLY DEFFERRED / INITIALLY IMMEDIATE.
e.g.:
alter table dept2 add constraint dept2_id_pk primary key (department_id) deferrable initially deferred; // deferring constraint on creation. ......

sql 数据库中不同数据库中两表创建视图

 CREATE VIEW MYVIEW
AS
   SELECT * from bjxxdiweb_database2007.dbo.bm_tongji
    UNION ALL
SELECT * from aa.DBO.chen
select * into aa..chen from bjxxdiweb_database2007.dbo.bm_tongji where 1=2
说明:数据库A的表的字段名必须和数据库B的表的字段名相同,包括数据类型等。 ......
© 2009 ej38.com All Rights Reserved. 关于E健网联系我们 | 站点地图 | 赣ICP备09004571号