下面可能是Oracle函数,mysql没能使用出来:first_value() over()和last_value() over(),分别是求分组中第一个和最后一个ratio_to_report() over(partition by ... order by ...):ratio_to_report() 括号中就是分子,over() 括号中就是分母percent_rank() over(partition by ... order by ...) 免责...
目录 一、Oracle数据库表分区概念和理解 表空间概念: 分区表概念: 什么时候使用分区表: 表分区的优缺点 一、Oracle数据库表分区概念和理解 表空间概念: 表空间指的是一个或多个数据文件的集合,所有的数据对象都存放在指定的表空间中,但主要存放的是表, 所以称作表空间。 通俗来讲,数据库(一套房子,可以有多个...
Oracle Partition - Range Composite (With Sub-partitions) Syntax For the range syntax, see range composite syntax. The subpartition list syntax is: subpartition_by_list Example Basis CREATE TABLE T_CNT_AGG_KPI_WEEK_TEST ( WEEK_CODE VARCHAR2(7 CHAR), CATEGORIE_CODE VARCHAR2(7 CHAR) ) PAR...
You can split a table partition by issuing the ALTER TABLE SPLIT PARTITION statement. 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 ...
The subpartition list syntax is: subpartition_by_list... Oracle Partition - Split How to split actual: range partition range interval partition list partition in two. where: AT Clause: The AT clause applies only to range partitions. VALUES Clause: The VALUES clause... Oracle Partition - ...
SQL> insert into table_name partition ( PartitionName) dataobj_to_partition(base_table, :physical_partid)) as SubQuery... 参考至:《McGraw.Hill.OCP.Oracle.Database.11g.New.Features.for.Administrators.Exam.Guide.Apr.2008》 http://www.oracle-base.com/articles/11g/partitioning-enhancement...
SET @@SQL_MODE = ''; CREATE TABLE employees ( id INT NOT NULL AUTO_INCREMENT PRIMARY KEY, fname VARCHAR(25) NOT NULL, lname VARCHAR(25) NOT NULL, store_id INT NOT NULL, department_id INT NOT NULL ) PARTITION BY RANGE(id) ( PARTITION p0 VALUES LESS THAN (5), PARTITION p1 VALUES...
CREATE TABLE dept (deptno NUMBER, deptname VARCHAR(32)) STORAGE (INITIAL 10K) PARTITION BY HASH(deptno) (PARTITION p1 TABLESPACE ts1, PARTITION p2 TABLESPACE ts2, PARTITION p3 TABLESPACE ts1, PARTITION p4 TABLESPACE ts3); If you create a local index for the above table, Oracle will ...
2 partition by hash(id) 3* partitions 3 store in(tbs01,tbs02,tbs03,jjjg) SQL> / 表已创建。 SQL> select partition_name,tablespace_name from user_tab_partitions 2 where table_name='T_PARTITION_HASH'; PARTITION_NAME TABLESPACE_NAME ...
Oracle Partitioned table feature enables the query optimizer to skip partitions that are not required by a particular SQL statement. Depending upon the SQL statement, the optimizer can identify partitions and sub-partitions that need to be accessed, as well as ones that do not. This can result...