Sql server 删除ID在#中的行

为什么我不能这样做：

declare @myTempTableList TABLE (
CommId int
)
insert into @myTempTableList (CommId)
VALUES 
(742), (803)

delete from myRealTable where MyRealTableId in (
    select mrt.MyRealTableId from MyRealTable mrt
    where commId in (@myTempTableList)
)

它告诉我，我必须声明标量变量@MyTestableList

delete from myRealTable where MyRealTableId in (
    select mrt.MyRealTableId from MyRealTable mrt
    where commId in (SELECT CommId FROM @myTempTableList)
)

试试上面的方法

DELETE FROM myRealTable 
WHERE EXISTS (SELECT 1
              FROM  @myTempTableList
              WHERE myRealTable.MyRealTableId  = @myTempTableList.CommId)