Oracle数据库基本概念理解（2）

--删除用户
drop user sz cascade;
--创建表空间
create tablespace worktablsp
datafile 'C:\app\lenovo\oradata\orcl\EMPTB.dbf' SIZE 5M
 AUTOEXTEND ON;
--修改表空间
ALTER tablespace worktablsp 
ADD datafile 'C:\app\lenovo\oradata\orcl\EMPTB.dbf' SIZE 5M;
 --扩展数据文件大小
 ALTER database 
 datafile 'C:\app\lenovo\oradata\orcl\EMPTB.dbf' RESIZE 6M;
 --删除
 DROP TABLESPACE worktablsp INCLUDING CONTENTS and datafiles
--创建用户:
CREATE USER RH
IDENTIFIED BY HR
DEFAULT  TABLESPACE tablespace  ;
--给用户授权:
  GRANT CONNECT TO RH;  --连接数据库角色
GRANT SELECT ON SCOTT.EMP TO RH;--查看SCOTT.EMP表的权限
 --分区表
 --范围分区
 create table saletb
 (
   saleid number ,
   productid number,
   saleDate date not null
 )
 partition  by range(saleDate)
 (
   partition p1 values less than(to_date('2013-01-01','yyyy-mm-dd')),
   partition p2 values less than(to_date('2014-01-01','yyyy-mm-dd')),
   partition p3 values less than(to_date('2015-01-01','yyyy-mm-dd')),
   partition p4 values less than(maxvalue)     
 );
 select * from saletb;
 insert into saletb values(1,1,to_date('2012-01-01','yyyy-mm-dd'));
  insert into saletb values(2,2,to_date('2013-06-01','yyyy-mm-dd'));
  insert into saletb values(3,3,to_date('2014-10-01','yyyy-mm-dd'));
  insert into saletb values(4,4,to_date('2016-01-01','yyyy-mm-dd'));
  select * from saletb partition(p3);
 --间隔分区 一个季度（三个月）一个分区
 CREATE TABLE SALES2
(
   SALES_ID NUMBER,
   PRODUCT_ID VARCHAR2(5),
   SALES_DATE DATE NOT NULL
)
    PARTITION BY RANGE(SALES_DATE)
    INTERVAL(NUMTOYMINTERVAL(3,'MONTH'))
    (PARTITION P1 VALUES LESS THAN (to_date('2013-04-1','yyyy/mm/dd')));
    --
    select * from sales2;
--插入数据
  INSERT INTO sales2 VALUES (1,'a',to_date('2013-08-1','yyyy/mm/dd'));
  INSERT INTO sales2 VALUES (3,'c',to_date('2013-02-1','yyyy/mm/dd'));
  --查看分区数据
 select * from sales2 partition(sys_p41);
 --获得分区情况
  SELECT table_name,partition_name 
      FROM user_tab_partitions 
   WHERE table_name=UPPER('sales2');