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 nested table storage table for indexing a nested table column Anindexis 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...
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 ...
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") ...
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...
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...