小编Kro*_*owi的帖子

我正在研究一个存储地址信息的数据库。（与我发布的这个问题有关）

我有2张桌子：

CREATE TABLE [dbo].[Country] (
[Code]          CHAR (2)     NOT NULL,
[Code3]         CHAR (3)     NOT NULL,
[CodeNumeric]   CHAR (3)     NOT NULL,
[Name]          VARCHAR (50) NOT NULL,
[ContinentCode] CHAR (2)     NOT NULL,
[CurrencyCode]  CHAR (3)     NOT NULL,
PRIMARY KEY CLUSTERED ([Code] ASC),
CONSTRAINT [CountryContinentFK] FOREIGN KEY ([ContinentCode]) REFERENCES [dbo].[Continent] ([Code]),
CONSTRAINT [CountryCurrencyFK] FOREIGN KEY ([CurrencyCode]) REFERENCES [dbo].[Currency] ([Code])
);

和

CREATE TABLE [dbo].[City] (
[Id]          INT           IDENTITY (1, 1) NOT NULL,
[Code]        VARCHAR (10)  NOT NULL,
[Name]        NVARCHAR (50) …