在附近计数storeprocedure语法的问题

我创建这样的存储过程，但越来越近@计数和@ count == 0的错误。任何人都可以figuer问题

set ANSI_NULLS ON

set QUOTED_IDENTIFIER ON

GO

ALTER PROCEDURE [dbo].[AddToCart] 

	@CustomerID varchar(50),

	@ProductID int,

	@Quantity int,

	@Count int

@Count=select count (*) from table where ProductID=@ProductID;

If(@Count==0)

AS

BEGIN

	INSERT INTO ShoppingCart

	(CustomerID,Quantity,ProductID) 

	VALUES(@CustomerID,@Quantity,@ProductID)

END