Use theCREATEINDEXstatement to create an index on: One or more columns of a table, a partitioned table, an index-organized table, or a cluster One or more scalar typed object attributes of a table or a cluster A
Use the CREATE INDEX statement to create an index on: One or more columns of a table, a partitioned table, an index-organized table, or a cluster One or more scalar typed object attributes of a table or a cluster A nested table storage table for indexing a nested table column An...
在OceanBase 数据库 Oracle 模式下,如果删除表中的任一索引列,则所创建的索引失效。 语法 CREATE[UNIQUE]INDEXindex_name ONtable_name(index_col_name,...)[index_type][index_options]index_type:USINGBTREEindex_options:index_option[index_option...]index_option:GLOBAL|LOCAL|COMMENT'str...
If you use the CREATE TABLE syntax to create an index on a partitioned table, the index will be created on each partition or subpartition. If the table definition includes the SUBPARTITION BY clause, each partition in the table will have a minimum of one subpartition. Each subpartition can ...
To create a unique index on 'cust_code' column in the table 'customer', the following SQL statement can be used : CREATE UNIQUE INDEX custcode ON customer(cust_code); Output: Create Index in MySQL, PostgreSQL, Oracle, SQL Server
语法及说明: create table table_name( col1 datatype, col2 datatype, ... ) partition by partition_method(column_name) ( partition partition_name values(value1), partition partition_name values(value2), ... ) 其中partition_methon可以用如下几种: range:按照分区; list:按照列表; hash:按照哈希...
PARTITION SYSTEM_DATACHANGETRACE_N_N201806 VALUES LESS THAN (TO_DATE('2019-06-01 00:00:00','yyyy/mm/dd hh24:mi:ss')) TABLESPACE SYSTEMT ); CREATE INDEX "SYSTEMUSER"."ISYSTEM_DATACHANGETRACE_N" ON "SYSTEMUSER"."SYSTEM_DATACHANGETRACE_N" ("SOURCEID", "SOURCETYPE") ...
Database version - 9.2.0.8 Create Partitioned table which PARTITION BY RANGE (EOW_DATE column which is of data type date) and then SUBPARTITION BY HASH (store column of number datatype) Below are the list of columns Name Null? Type ...
CREATE TABLE http://download.oracle.com/docs/cd/E11882_01/server.112/e17118/statements_7002.htm#SQLRF01402 表空间(tableSpace) 段(segment) 盘区(extent) 块(block) 关系 一. Storage 参数说明 1. INITIAL Specify the size of the first extent of the object. Oracle allocates spac...
oracle create table partition by 表达式在Oracle数据库中,分区表是一种将表物理上分割成多个独立的部分的技术。每个分区可以独立于其他分区进行存储、备份和索引,从而提高了查询性能、数据管理和维护的便利性。 创建分区表时,您可以使用表达式来确定分区键,这个表达式基于表中的一列或多列。例如,您可能想要根据日期对...