default_constraints WHERE parent_object_id=912162445 SQL Copy Here we get the constraints name that we have created. Now we are able to drop the constraints by using the above name. alter table STUDENT_DETAILS drop constraint DF__STUDENT_D__IS_RE__3846C6FF SQL Copy Now we are able to ...
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SQL USEAdventureWorks2022; GO-- Return the name of primary key.SELECTnameFROMsys.key_constraintsWHEREtype='PK'ANDOBJECT_NAME(parent_object_id) = N'TransactionHistoryArchive'; GO 若要创建DROP脚本,请使用上一个查询的结果。 将<primary-key-constraint>替换为正确的值。 它看起来可能类似于PK_Transaction...
和INSERT一样,对于每一个索引,SQL Server都会从跟节点向下直到找到叶子节点。当找到叶子节点之后,SQL Server可能会马上删除这条数据,也可能不马上删除,而是在页中的标志位设置这页已经被删除。这种逻辑上被删除但物理上还存在术语称为:虚影记录(GHOST Record),在接下来合适的时机,SQL Server才会删除虚影记录,我将在...
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....
You can implement error handling for the DELETE statement by specifying the statement in aTRY...CATCHconstruct. 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 ...
The DELETE statement may fail if it violates a trigger or tries to remove a row referenced by data in another table with a FOREIGN KEY constraint. If the DELETE removes multiple rows, and any one of the removed rows violates a trigger or constraint, the statement is canceled, an error is...
T-SQL GETDATE() ? ADD and SUBTRACT depending on the condition is CASE STATEMENT ADD COLUMN to variable table? Add prefix in data column Add Time in SQL HH:MM:SS to another HH:MM:SS Adding a column to a large (100 million rows) table with default constraint adding a extra column in...
MySQL在删除一张表时出现 ERROR 1217 (23000): Cannot delete or update a parent row: a foreign key constraint fails 原因 可能是在Mysql中,删除的表和另一张表设置了foreign key的关联,造成无法更新或删除数据; 解决方案 可以通过设置FOREIGN_KEY_CHECKS变量来避免这种情况。
CREATE TABLE dbo.rawData ( rowId INT IDENTITY PRIMARY KEY, AreaId INT, MeasureId INT, someData UNIQUEIDENTIFIER DEFAULT NEWID(), DateEnergy DATETIME DEFAULT GETDATE(), addedBy VARCHAR(30) DEFAULT SUSER_NAME(), ts ROWVERSION ) GO CONSTRAINT [PK_RawData] PRIMARY KEY CLUSTERED ([AreaId] ASC...