Applies to: SQL Server 2016 (13.x) and later versions Azure SQL Database Azure SQL Managed Instance SQL database in Microsoft Fabric You can delete a foreign key constraint in SQL Server by using SQL Server Management Studio or Transact-SQL. Deleting a foreign key constraint removes the ...
3. Cascade delete, SQL Server 有自带的 cascade delete 功能, principal 被删除, foreign 也一起被删除 4. Restrict delete, 除了 cascade delete, 也可以设置约束, 一旦有 foreign, principal 就不能被删除. (这个是默认行为) 5. Foreign constraint, 当输入一个不存在的 foreign key, SQL Server 会报错. ...
SQL USEAdventureWorks2022; GOALTERTABLEdbo.DocExeDROPCONSTRAINTFK_Column_B; GO 有关详细信息,请参阅ALTER TABLE (Transact-SQL)。 后续步骤 ALTER TABLE (Transact-SQL) sys.key_constraints (Transact-SQL) 创建外键关系 修改外键关系 反馈 此页面是否有帮助?
下面是SQL Server表关联删除的状态图: 开始连接数据库设置外键关联执行删除操作提交事务关闭连接结束 步骤说明 连接数据库:首先,我们需要使用适当的连接字符串来连接到SQL Server数据库。你可以使用以下代码来实现: stringconnectionString="Data Source=serverName;Initial Catalog=databaseName;User ID=userName;Password=p...
在实际应用中,需要根据具体情况选择合适的处理方法,确保数据的完整性和一致性。希望本文对您了解SQL Server中Delete操作及其关联表问题有所帮助。 参考资料: [Microsoft SQL Server Documentation]( [SQL Server Delete with Join]( [Understanding Foreign Key Constraint in SQL Server](...
TheDELETEstatement may fail if it violates a trigger or tries to remove a row referenced by data in another table with aFOREIGN KEYconstraint. If theDELETEremoves multiple rows, and any one of the removed rows violates a trigger or constraint, the statement is canceled, an error is returned...
SQL Server 2016 中有外键的表无法被Truncate,只能被Delete 问: I get the following message even when the table that references it is empty: "Cannot truncate table 'dbo.Link' because it is being referenced by a FOREIGN KEY constraint" Doesn't seem to make much sense why this is occurring....
AlterSymmetricKeyStatement AlterTableAddTableElementStatement AlterTableAlterColumnOption AlterTableAlterColumnStatement AlterTableAlterIndexStatement AlterTableAlterPartitionStatement AlterTableChangeTrackingModificationStatement AlterTableConstraintModificationStatement AlterTableDropTableElement AlterTableDropTableEle...
PrimaryKeyConstraint.ColumnsRelationship 程序 PromotedNodePathForSqlType PromotedNodePathForXQueryType 通訊協定 QueryStoreCaptureMode QueryStoreDesiredState 佇列 QueueEventNotification RecoveryMode RejectType RelationshipType RemoteServiceBinding ResourceGovernor ResourcePool 角色 RoleMembership 路由 規則 SamplingStyle Sca...
--在更新或删除的下拉框选择级联就可以了 脚本如下 alter table 外键表 Add constraint fk_ygid_xsygid --约束名 Foreign key(外键的字段) references 主键表(主键)on update cascade --级联更新 on delete cascade --级联删除 --执行这个语句 就可以直接删除 关联的表就删掉了 界面操作也...