为什么我在T-SQL中收到此错误

我正在为我的大学课学习SQL，我应该创建一些非常基本的表。这个因某些原因不起作用。请帮忙。



消息102，等级15，状态1，行9

语法附近'）'

I am studying SQL for my college class and I am supposed to create some very basic tables. This one won't work for some reason. Please help.

Msg 102, Level 15, State 1, Line 9
Incorrect syntax near ')'

CREATE TABLE Member_Activity
(
	Activity_Type NVARCHAR(4) NOT NULL,
	"Member_ID" INT IDENTITY(1,1) NOT NULL,
	Posts REAL NOT NULL,
	Messages REAL NOT NULL,
	CONSTRAINT "PK_Activity_Type" PRIMARY KEY(Activity_Type),
	CONSTRAINT "FK_Member_ID" FOREIGN KEY(Member_ID)
);