小编And*_*eyR的帖子

假设我在SQL Server中有以下数据库:

CREATE TABLE [Order]
(
  ID BIGINT IDENTITY(1,1)
  CONSTRAINT PK_Order PRIMARY KEY CLUSTERED (ID)
);

CREATE TABLE OrderItem
(
  ID BIGINT IDENTITY(1,1),
  ORDER_ID BIGINT NOT NULL,
  PRICE_ID BIGINT NOT NULL,
  DISCOUNTED_PRICE_ID BIGINT NULL,
  CONSTRAINT PK_OrderItem PRIMARY KEY CLUSTERED (ID)
);

CREATE TABLE Price
(
  ID BIGINT IDENTITY(1,1),
  AMOUNT FLOAT NOT NULL,
  CURRENCY VARCHAR(3) NOT NULL,
  CONSTRAINT PK_Price PRIMARY KEY CLUSTERED (ID)
);

ALTER TABLE OrderItem ADD CONSTRAINT FK_OrderItem_Order
FOREIGN KEY (ORDER_ID) REFERENCES [Order](ID) ON DELETE CASCADE;

ALTER TABLE OrderItem …