根据字段查询表时，将另一字段部分数据加-号,怎么处理呢

根据字段查询表时，将另一字段部分数据加-号,怎么办呢？
point表

POINT TYPE  
 3 1
 4 2
 2 1
 4 1
 1 2
 3 1

我想查询时，把type=2 的字段对应的point都加个负号。我想对point求和sum(point)
显示这样的结果
POINT TYPE
3 1
-4 2
2 1
4 1
-1 2
3 1
要怎么写呢？如有解答，不胜感激！

[解决办法]

SQL code

--> 测试数据：[point]if object_id('[point]') is not null drop table [point]create table [point]([POINT] int,[TYPE] int)insert [point]select 3,1 union allselect 4,2 union allselect 2,1 union allselect 4,1 union allselect 1,2 union allselect 3,1select case when [type]=2 then -[POINT] else [POINT] end as [POINT],[TYPE] from [point]/*POINT    TYPE3    1-4    22    14    1-1    23    1*/--求和：select [TYPE],sum(case when [type]=2 then -[POINT] else [POINT] end) as [POINT] from [point] group by [TYPE]  /* TYPE    POINT1    122    -5 */
[解决办法]
SQL code
--求和：select sum(case when [type]=2 then -[POINT] else [POINT] end) as [POINT] from [point]  /*POINT7*/