问Oracle SQL集合表格项值，基于crationdate和foreignkeysEN使用对象初始值设定项，你可以在创建对象时向对...
1.禁用该约束 select*fromuser_constraints cwherec.table_name='TABLE_NAME'; alter table TABLE_NAME disable constraint CONSTRAINT_NAME CASCADE; 2.删除表的时候,级联删除约束 drop table TABLE_NAME cascade constraints;
Oracle foreign key constraint in actions The following statement works because the supplier_groups table has a row with group_id 1: INSERT INTO suppliers(supplier_name, group_id) VALUES('Toshiba',1); Code language: SQL (Structured Query Language) (sql) However, the following statement will ...
Oracle Database - Enterprise Edition - Version 10.2.0.1 and later Information in this document applies to any platform. Symptoms SQL> DROP TABLESPACE <tablespace_name> INCLUDING CONTENTS AND DATAFILES; DROP TABLESPACE <tablespace_name> INCLUDING CONTENTS AND DATAFILES * ERROR at line 1: ORA-02449...
主键(primary key) 外键(foreign key):被参照的键必须有唯一约束或是主键 非空(not null) 默认(default) 检查(check):oracle独有 唯一(unique) 2. 六大约束的用法 以下所有演示的SQL语句都是基于Oracle,可能在MySQL中使用有些出入。不过不用担心,后面会指出一些MySQL与Oracle的不同之处 ...
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SQL Server / Oracle / MS Access: CREATETABLEOrders ( OrderID intNOTNULLPRIMARYKEY, OrderNumber intNOTNULL, PersonID intFOREIGNKEYREFERENCESPersons(PersonID) ); To allow naming of aFOREIGN KEYconstraint, and for defining aFOREIGN KEYconstraint on multiple columns, use the following SQL syntax: ...
然后drop了foreign key的constraint之后,drop primary key的操作就可以了继续了。 在脚本最后,需要记得重建那个foreign key. 代码语言:javascript 代码运行次数:0 运行 AI代码解释 SQL>ALTERTABLEAR3_GL_UNBILLED_REVADDCONSTRAINTAR3_GL_UNBILLED_REV_1FKFOREIGNKEY(ACCOUNT_ID)REFERENCESAR1_ACCOUNT(ACCOUNT_ID);Table...
Oracle数据库中,约束具体包括非空(NOT NULL)约束、唯一键(UNIQUE)约束、主键(PRIMARY KEY)约束、外键(FOREIGN KEY)约束和检查(CHECK)约束五种。 和数据表类似,约束也属于数据库对象,可以在建表的同时创建其相关约束,也可以在建表后单独添加;可以由用户命名,也可以由系统按照默认格式自动对约束进行命名;按照约束的定...
But when I run the .SQL file that I export to create the new database... it gives me an error. I think it's because it wants all of the ALTER TABLE ADD FOREIGN KEY commands run after the tables have been created. Is this true? Is there a way to set the mode so that it ...