USE Study
GO

CREATE TABLE orders(
	oseq int IDENTITY(1, 1) CONSTRAINT PK_oseq PRIMARY KEY,
	quantity VARCHAR(20) NULL,
	indate DATETIME NULL,
	id VARCHAR(20) CONSTRAINT FK_id REFERENCES customer(id)
)

INSERT INTO orders(quantity, id) VALUES(5, 'one')

INSERT INTO orders(quantity, id) VALUES(5, 'test')
