如果SQL Server中有一个外键约束，如何删除表?

I have the following:

我有以下几点:

DROP TABLE [dbo].[ExtraUserInformation];
DROP TABLE [dbo].[UserProfile];
DROP TABLE [dbo].[webpages_Membership];
DROP TABLE [dbo].[webpages_OAuthMembership];
DROP TABLE [dbo].[webpages_Roles];
DROP TABLE [dbo].[webpages_UsersInRoles];

CREATE TABLE [dbo].[ExtraUserInformation] (
    [Id]       INT            IDENTITY (1, 1) NOT NULL,
    [UserId]   INT            NOT NULL,
    [FullName] NVARCHAR (MAX) NULL,
    [Link]     NVARCHAR (MAX) NULL,
    [Verified] BIT            NULL,
    CONSTRAINT [PK_dbo.ExtraUserInformation] PRIMARY KEY CLUSTERED ([Id] ASC)
);

CREATE TABLE [dbo].[webpages_UsersInRoles] (
    [UserId] INT NOT NULL,
    [RoleId] INT NOT NULL,
    PRIMARY KEY CLUSTERED ([UserId] ASC, [RoleId] ASC),
    CONSTRAINT [fk_UserId] FOREIGN KEY ([UserId]) REFERENCES [dbo].[UserProfile] ([UserId]),
    CONSTRAINT [fk_RoleId] FOREIGN KEY ([RoleId]) REFERENCES [dbo].[webpages_Roles] ([RoleId])
);
DROP TABLE [d