ALTER TABLE yourtablename NOCHECK CONSTRAINT ALL; 禁用指定表的单个外键约束: sql ALTER TABLE yourtablename NOCHECK CONSTRAINT yourforeignkeyconstraintname; 3. MySQL 在MySQL中,由于InnoDB存储引擎自动管理外键约束,你不能直接禁用外键约束,但可以通过设置foreign_key_checks系统变量来间接实现: sql -- 禁用外...
-- Disable foreign key constraintALTERTABLEChildTable NOCHECKCONSTRAINTFK_Child_Parent; 1. 2. 数据修复的流程图是这样设计的: 关闭外键约束执行数据更新重新开启外键约束验证数据完整性 同时,以下是多语言示例代码: Bash脚本 #!/bin/bash# Disabling foreign key constraintssqlcmd-Q"ALTER TABLE ChildTable NOCHECK...
ALTERTABLE表名ADDCONSTRAINT外键约束名FOREIGNKEY(column1, column2,...column_n)REFERENCES外键所依赖的表 (column1,column2,...column_n)ONDELETECASCADE;--级联删除 撤销FOREIGN KEY 约束 如需撤销 FOREIGN KEY 约束,请使用下面的 SQL: --MySQL:ALTERTABLEOrdersDROPFOREIGNKEYfk_PerOrders--SQL Server / Oracle...
mysql> insert into t_tudent values(112,'爱国的吴京',6); ERROR 1452 (23000): Cannot add or update a child row: a foreign key constraint fails (`test_wl`.`t_tudent`, CONSTRAINT `t_tudent_ibfk_1` FOREIGN KEY (`t_class`) REFERENCES `t_class` (`class_num`)) 1. 2. 3. 4. 5...
To disable a foreign key constraint for replicationTo perform this task in Transact-SQL, script out the foreign key constraint. In Object Explorer, expand the table with the foreign key constraint you want to modify, and then expand the Keys folder. Right-click the foreign key constra...
You can disable a foreign key constraint during INSERT and UPDATE transactions in SQL Server by using SQL Server Management Studio or Transact-SQL. Use this option if you know that new data will not violate the existing constraint or if the constraint applies only to the data already in the ...
To disable a foreign key constraint for INSERT and UPDATE statementsIn Object Explorer, connect to an instance of Database Engine. On the Standard bar, select New Query. Copy and paste the following example into the query window and select Execute. SQL Másolás USE AdventureWor...
在MySQL中，外键约束用于确保两个表之间的数据一致性。外键约束是一种限制，它将一个表中的列与另一个...
在脚本的ALTER TABLE ... ADD CONSTRAINT部分,修改新的外键约束并指定 NOT FOR REPLICATION 选项。 例如: SQL ALTERTABLE[Sales].[SalesTerritoryHistory]DROPCONSTRAINT[FK_SalesTerritoryHistory_SalesPerson_BusinessEntityID]GOALTERTABLE[Sales].[SalesTerritoryHistory]WITHCHECKADDCONSTRAINT[FK_SalesTerrit...
alter table 表名 add constraint 主键名 primary key(字段名1,字段名2……) 1. 2. 3. 4. 2、Foreign Key约束 外键约束是用来加强两个表(主表和从表)的一列或多列数据之间的连接的。创建外键约束的顺序是先定义主表的主键,然后定义从表的外键。也就是说只有主表的主键才能被从表用来作为外键使用,被约束...