varchar 转 int,该如何解决

varchar 转 int
我的目的是：先把字段HFNR_KHMYD中的汉字转换为1,2...等，然后分组求和hfnr_khmyd,代码如下：

select hfnr_sjwj,sum(convert(int as hfnr_khmyd), )
case when hfnr_khmyd='满意' then 3
when hfnr_khmyd='基本满意' then 2
when hfnr_khmyd='一般' then 1
when hfnr_khmyd='不满意' then 0 end 
else -1 end as 客户满意度
from cc_hfnr 
group by hfnr_sjwj


错误：消息 156，级别 15，状态 1，第 1 行
关键字 'convert' 附近有语法错误。

请教一下。。。

[解决办法]

SQL code

select hfnr_sjwj,sum(case when hfnr_khmyd='满意' then 3when hfnr_khmyd='基本满意' then 2when hfnr_khmyd='一般' then 1when hfnr_khmyd='不满意' then 0 end else -1 end)as 客户满意度from cc_hfnr group by hfnr_sjwj
[解决办法]
SQL code
select hfnr_sjwj,sum(case   when hfnr_khmyd='满意' then 3  when hfnr_khmyd='基本满意' then 2  when hfnr_khmyd='一般' then 1  when hfnr_khmyd='不满意' then 0   else -1 end) as 客户满意度from cc_hfnr group by hfnr_sjwj