Както Мартин предложи, трябва да активирате IDENTITY_INSERT
така че да можете да прокарате собствените си ценности за идентичност. Може също да се наложи да придобиете заключване на таблица, за да сте сигурни, че Max( Id) връща правилната стойност.
If object_id('tempdb..#TestData') is not null
Drop Table #TestData
GO
Create Table #TestData
(
Id int not null identity(1,1) Primary Key
, ParentId int not null
, Name varchar(50) not null
)
GO
Set Identity_Insert #TestData On
GO
Insert #TestData( Id, ParentId, Name )
Values( 1,0,'Food' )
, ( 2,1,'Taste' )
, ( 3,1,'Price' )
, ( 4,2,'Taste Requirement' );
With Data As
(
Select Cast(MaxId.Id + 1 As int) As Id
, T.ParentId
, 'Copy Of ' + T.name As Name
, T.Id As OldId
, 0 As OldParentId
From #TestData As T
Cross Join( Select Max( id ) As Id From #TestData ) As MaxId
Where T.Name = 'Food'
Union All
Select Cast(Parent.id + Row_Number() Over( Order By Child.Id ) + 1 As int)
, Parent.Id
, 'Copy of ' + Child.Name
, Child.Id
, Child.ParentId
From Data As Parent
Join #TestData As Child
On Child.ParentId = Parent.OldId
)
Insert #TestData( Id, ParentId, Name )
Select Id, ParentId, Name
From Data
GO
Set Identity_Insert #TestData Off
GO
Резултати
id | parentid | name -- | -------- | ----------------- 1 | 0 | Food 2 | 1 | Taste 3 | 1 | Price 4 | 2 | Taste Requirement 5 | 0 | Copy Of Food 7 | 5 | Copy of Taste 8 | 5 | Copy of Price 9 | 7 | Copy of Taste Requirement