sql server-using group by子句我希望所有值都为null而不是null值

Question

我在sql server中编写了一个查询，如下所示......

SELECT 
      [AC_NO],part_no,  
      SUM(CASE WHEN sex='M' THEN 1 ELSE 0 END) as male , 
SUM(CASE when sex='F' THEN 1 ELSE 0 END) as female,
SUM(CASE when sex='o' THEN 1 ELSE 0 END) as other,
SUM(CASE WHEN sex='M' THEN 1 ELSE 0 END) as male
 FROM [ALL_ERMS_S1_S2_2014].[dbo].[ALL_MR_ERMS] where ORG_LIST_NO=2 and ac_no=91 and  STATUSTYPE='N'
group by ac_no,part_no
order by ac_no,part_no



**ac_no PART_NO male    female  other   total**

    91    2  1    0   0   1

    91    3   1   1   0   2

    91    4   1   1   0   2

    91    7   1   1   0   2

    91    8   4   2   0   6

我得到的结果如下......

在Part_no col中你可以标记1,5,6缺少b在该部分中所有值都是0.我想在下面...

        ac_no   PART_NO  male   female  other     total

           91      1      0    0       0         0

           91      2      1    0       0         1

           91      3      1    1       0         2

           91      4      1    1       0         2

           91      5      0    0       0         0

           91      6      0    0       0        0

           91      7      1    1       0        2

           91      8      4    2       0        6

请帮帮我.... 我怎样才能得到这个结果....