I dette indlæg vil vi lære, hvordan man dropper identitetsegenskaber for en kolonne i SQL Server Table.

Vi vil følge nedenstående trin.

• Tilføj en ny kolonne med TestID til eksisterende tabel
• Opdater posterne fra Id ( Identity Enable Column) til TestID (Newly Added) Column.
• Slip id'et ( Identity Enable Column) fra tabellen
• Omdøb den nyligt tilføjede kolonne (TestID) til Id.

--Create Table with Identity Property
CREATE TABLE dbo.Employee ( Id INT IDENTITY(1,1), Name VARCHAR(10))
GO

--Insert the record after creating Table with Identity Property on Id Column
INSERT INTO dbo.Employee 
VALUES('Shahzad')
GO

--Run to See the Data
SELECT * FROM dbo.Employee

--Find out all the columns for all the tables on which Identity Property is enabled
SELECT OBJECT_NAME(OBJECT_ID) AS TableName,name AS ColumnName FROM sys.columns
WHERE is_identity=1

/** Drop Identity ********/
--Add a new column with any name
ALTER TABLE dbo.Employee
ADD TestId INT

--Update the Records in newly Added column , in our case TestID
UPDATE dbo.Employee
SET TestId=Id

--Drop Identity Column
ALTER TABLE dbo.Employee
DROP COLUMN Id

--Rename the newly Added Column to Identity Column you had at first.
EXEC sp_rename 'dbo.Employee.TestId','Id','COLUMN'


Videodemo :Sådan droppes identitetsegenskab for en kolonne i SQL Server-tabel