ORACLE新增主键问题【CREATE PRIMARY KEY AFTER CREATED A TABLE】 我们都遇到过需要在已建立的表上新增主键的问题(设计发生变化时), 在建立主键时我们有些问题需要注意。 1.最好指定主键名称和其他存储的属性 SQL> alter table larry_test add primary key (terminal_id); Table altered. 这样的SQL语句没有问题,...
Oracle PL/SQL:CREATE TABLE statement: create a table with primary key.CREATE TABLE statement can be used to create table objects in database. It is possible to add constraints like primary key ,foreign key while table creation.Primary key is the unique identifier for a row of data.One ...
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] INDEX index_name ON table_name (key_part,...) [index_type] [index_options] index_type: USING BTREE index_options: index_option [index_option...] index_option: GLOBAL...
When you create a primary key or unique constraint, Oracle Database will automatically create a unique index for you (assuming there isn't an index already available). In most cases you'll add the constraint to the table and let the database build the index for you....
OrderID INT PRIMARY KEY, OrderDate DATE, CustomerID INT, TotalAmount DECIMAL(10, 2) ); 这段代码在Sales模式下创建了一个名为Orders的表。 十、CREATE SEQUENCE:创建序列 CREATE SEQUENCE用于创建一个序列。序列生成一系列唯一的数值,通常用于生成主键。
obclient>CREATE TABLE ref_t1(c1 INT PRIMARY KEY,C2 INT);Query OK,0rows affected obclient>CREATE TABLE ref_t2(c1 INT PRIMARY KEY,C2 INT,FOREIGN KEY(c2)REFERENCES ref_t1(c1)ON DELETE SET NULL);Query OK,0rows affected 创建非模板化的 Range + Range 二级分区表。
Oracle Database - Enterprise Edition - Version 10.1.0.5 to 11.2.0.1.0 [Release 10.1 to 11.2]Information in this document applies to any platform.SymptomsAdding a primary key constraint to a composite partitioned table generates an "ORA-01408: such column list already indexed" error.ORA-01408:...
关键字 PRIMARY KEY 按条件检查 CHECK (条件) 外键REFERENCES 表名(字段名) 3. 创建表的例子 CREATE TABLE DEPT( EPTNO NUMBER(2) CONSTRAINT PK_DEPT PRIMARY KEY, DNAME VARCHAR2(14), LOC VARCHAR2(13)) ; CREATE TABLE region( ID number(2) NOT NULL PRIMARY KEY, ...
To enable a unique or primary key constraint, you must have the privileges necessary to create an index on the table. You need these privileges because Oracle creates an index on the columns of the unique or primary key in the schema containing the table....
To enable a unique or primary key constraint, you must have the privileges necessary to create an index on the table. You need these privileges because Oracle Database creates an index on the columns of the unique or primary key in the schema containing the table. ...