ORACLE 经常使用脚本（1）

1. 查看oracle的版本信息：  Select version FROM Product_component_version
  Where SUBSTR(PRODUCT,1,6)='Oracle';

2. 查看数据库库对象： select owner, object_type, status, count(*) count# from all_objects group by owner, object_type, status;

3. 查看数据库的建立日期和归档方式： Select Created, Log_Mode, Log_Mode From V$Database;

4. 查看当前全部对象： select * from tab;

5. 建一个和a表结构同样的空表：

 create table b as select * from a where 1=2;

 create table b(b1,b2,b3) as select a1,a2,a3 from a where 1=2;

6. 查看数据文件放置的路径： select  tablespace_name,file_id,bytes/1024/1024,file_name from dba_data_files order by file_id;

7. 链接字符串

 select 列1||列2 from 表1;

 select concat(列1,列2) from 表1;

8. 查询当前日期

 select to_char(sysdate,'yyyy-mm-dd,hh24:mi:ss') from dual;

9. 用户间复制数据

 copy from user1 to user2 create table2 using select * from table1;

10. 视图中不能使用order by，但可用group by代替来达到排序目的

 create view a as select b1,b2 from b group by b1,b2;

11. 经过受权的方式来建立用户

 grant connect,resource to test identified by test;

 conn test/test