如何在SQL服务器中使用ID连接字符串?

This is my T-SQL code.

这是我的T-SQL代码。

CREATE TABLE [dbo].[AspNetUsers] 
(
    [Id]            NVARCHAR (128) NOT NULL,
    [Email]         NVARCHAR (256) NULL,
    [PasswordHash]  NVARCHAR (MAX) NULL,
    [UserName]      NVARCHAR (256) NOT NULL,
    [FirstName]     NVARCHAR(50) NOT NULL DEFAULT /*what goes in here*/, 
    [LastName]      NVARCHAR(50) NOT NULL DEFAULT 'LastName', 

    CONSTRAINT [PK_dbo.AspNetUsers] 
        PRIMARY KEY CLUSTERED ([Id] ASC)
);
GO

CREATE UNIQUE NONCLUSTERED INDEX [UserNameIndex]
    ON [dbo].[AspNetUsers]([UserName] ASC);
CREATE