윤귀의 우주속 티끌

-- Create products table.
CREATE TABLE products (id int IDENTITY PRIMARY KEY, product varchar(40))
GO
-- Inserting values into products table.
INSERT INTO products (product) VALUES ('screwdriver')
INSERT INTO products (product) VALUES ('hammer')
INSERT INTO products (product) VALUES ('saw')
INSERT INTO products (product) VALUES ('shovel')
GO

-- Create a gap in the identity values.
DELETE products
WHERE product = 'saw'
GO

SELECT *
FROM products
GO

-- Attempt to insert an explicit ID value of 3;
-- should return a warning.
INSERT INTO products (id, product) VALUES(3, 'garden shovel')
GO
-- SET IDENTITY_INSERT to ON.                    <--  이녀석이 on 이 되어야지만 실행이된다. 안그러면 에러가뜸
SET IDENTITY_INSERT products ON
GO

-- Attempt to insert an explicit ID value of 3
INSERT INTO products (id, product) VALUES(3, 'garden shovel')
GO

SELECT *
FROM products
GO
-- Drop products table.
DROP TABLE products
GO