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])
);

但是,这是一个失败的消息说：

Msg 3726,Level 16,State 1,Line 6
Could not drop object 'dbo.UserProfile' because it is referenced by a FOREIGN KEY constraint.
Msg 3726,Line 9
Could not drop object 'dbo.webpages_Roles' because it is referenced by a FOREIGN KEY constraint.
Msg 2714,State 6,Line 27
There is already an object named 'UserProfile' in the database.
Checking identity information: current identity value 'NULL',current column value 'NULL'.
DBCC execution completed. If DBCC printed error messages,contact your system administrator.

在这种情况下,我该怎么放桌子？