Ошибка при создании внешнего ключа

CREATE TABLE [dbo].[Categories] (
    [Id]          INT            IDENTITY (1, 1) NOT NULL,
    [Name]        NVARCHAR (100) NOT NULL,
    [Description] NVARCHAR (500) NULL,
    CONSTRAINT [PK_dbo.Categories] PRIMARY KEY CLUSTERED ([Id] ASC)
);

CREATE TABLE [dbo].[Products] (
    [Id]          INT            IDENTITY (1, 1) NOT NULL,
    [CategoryId]  INT            NOT NULL,
    [Name]        NVARCHAR (100) NOT NULL,
    [Cost]        FLOAT (53)     NOT NULL,
    [Count]       INT            NOT NULL,
    [Description] NVARCHAR (500) NULL,
    [Icon]        NVARCHAR (MAX) NULL,
    CONSTRAINT [PK_dbo.Products] PRIMARY KEY CLUSTERED ([Id] ASC),
    CONSTRAINT [FK_Products_Categories] FOREIGN KEY([CategoryId]) REFERENCES [Categories]([Id]) ON DELETE SET NULL
);

    CONSTRAINT [FK_Products_Categories] FOREIGN KEY([CategoryId]) REFERENCES [Categories]([Id]) ON DELETE (DELETE * FROM [dbo].[Products] WHERE CategoryId=NULL)

 [CategoryId]  INT            NULL

CREATE TABLE Categories (
    [Id]          INT            IDENTITY (1, 1),
    [Name]        NVARCHAR (100) NOT NULL,
    [Description] NVARCHAR (500) NULL,
    CONSTRAINT [PK_dbo.Categories] PRIMARY KEY CLUSTERED (Id)
);

CREATE TABLE Products (
    Id          INT            IDENTITY (1, 1) NOT NULL,
    CategoryId  INT            NOT NULL,
    Name        NVARCHAR (100) NOT NULL,
    Cost       FLOAT (53)     NOT NULL,
    Count       INT            NOT NULL,
    Description NVARCHAR (500) NULL,
    Icon        NVARCHAR (MAX) NULL,
    CONSTRAINT [PK_dbo.Products] PRIMARY KEY CLUSTERED (Id ASC),
    CONSTRAINT [FK_Products_Categories] FOREIGN KEY(CategoryId) REFERENCES Categories(Id) ON DELETE CASCADE );