BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT) TABLESPACE "SYSTEMT" ENABLE) SEGMENT CREATION IMMEDIATE PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING LOB ("CHANGECONTENT") S
对于外部应用程序来说,虽然存在不同的分区,且数据位于不同的表空间,但逻辑上仍然是一张表 可以使用SQL*Loader,IMPDP,EXPDP,Import,Export等工具来装载或卸载分区表中的数据 关于分区表的功能实际上同SQL server 中的分区表是同样的概念,只不过SQL server中的数据存放到了文件组,相当于Oracle概念中的表空间 分区信息...
SQL> create tablespace par01 datafile 'e:\oracle\test\par01.dbf' size 10m ; SQL> create tablespace par02 datafile 'e:\oracle\test\par02.dbf' size 10m ; SQL> create tablespace par03 datafile 'e:\oracle\test\par03.dbf' size 10m ; --2、并加上权限 alter user fmismain quota unlimited ...
sum(sal) over () 不按部门,求所有员工总和,效果等同于sum(sal)。 SQL> select deptno,ename,sal, 2 sum(sal) over (partition by deptno order by ename) 部门连续求和,--各部门的薪水"连续"求和 3 sum(sal) over (partition by deptno) 部门总和, -- 部门统计的总和,同一部门总和不变 4 100*round...
oracle的sql语句 进行去重应用背景查询出多条数据,这些数据中有一个或者多个字段的值一样,现在要对一样数据进行去重。 oracle的sql语句 select * from ( select tf.*,ROW_NUMBER() OVER(PARTITION BY ** ORDER BY * DESC ) RN...
Decode the result from row_number over, partition by, order by : ROW_NUMBER « Analytical Functions « Oracle PL / SQL Decode the result from row_number over, partition by, order by SQL> SQL> SQL> CREATE TABLE EMP (EMPNO NUMBER(4) NOT NULL, 2 ENAME VARCHAR2(10), 3 JOB ...
Changes in This Release for Oracle Database VLDB and Partitioning Guide 1 Introduction to Very Large Databases 2 Partitioning Concepts 3 Partitioning for Availability, Manageability, and Performance 4 Partition Administration 4.1 Specifying Partitioning When Creating Tables and Indexes ...
Referenced InDatabase SQL Language Reference ContributorOracle CreatedMonday October 05, 2015 Statement1 This table creates partitions by range. Create a table with a number of partitions CREATETABLEempl_h ( employee_idNUMBER(6)PRIMARYKEY, first_name VARCHAR2(20), last_name VARCHAR2(25), email ...
If there are local indexes defined on the table, this statement also splits the matching partition in each local index. Because Oracle assigns system-generated names and default storage attributes to the new index partitions, you may wish to rename or alter these index partitions after splitting ...
(HWM, the largest size the table has ever occupied). A high HWM slows full-table scans, because Oracle Database has to search up to the HWM, even if there are no records to be found. When a partition is dropped, the segment itself is gone and the HWM of other segments remains the...