嵌套插入SQL查询

我使用MS sql作为数据库。我想为此编写一个嵌套查询。我的问题是：

INSERT INTO [Node-churn](total_amount_in)  values=
       (SELECT sum(cast(amount as float)) 
        FROM [CDR-IN] 
        WHERE [Node-churn].subscriber=[CDR-IN].callee) 
WHERE degree <6

插入到[节点搅动]（总金额）值中=
（选择金额（铸造（浮动金额））
从[CDR-IN]
其中[Node Chorn].subscriber=[CDR-IN].callee）
其中degree这是
select
语句的类型：

insert into [Node-churn](total_amount_in)
    select sum(cast(amount as float))
    from [CDR-IN]
    where [Node-churn].subscriber = [CDR-IN].callee and degree < 6;

我不确定是否可以在insert查询中使用WHERE。可能是打字错误，正确的语法是

INSERT INTO [Node-churn](total_amount_in)  values= 
   (SELECT sum(cast(amount as float)) 
    FROM [CDR-IN] 
    WHERE [Node-churn].subscriber=[CDR-IN].callee and degree <6
)

插入[节点搅动]（总金额）值=
（选择金额（铸造（浮动金额））
从[CDR-IN]
其中[Node Chorn].subscriber=[CDR-IN]。被叫方和度
INSERT INTO [Node-churn](total_amount_in)  values= 
   (SELECT sum(cast(amount as float)) 
    FROM [CDR-IN] 
    WHERE [Node-churn].subscriber=[CDR-IN].callee and degree <6
)