求一个group by 句子
表大致如下:   
 Gender                  Section 
 M                                       1 
 M                                       1 
 F                                          1 
 F                                          2 
 M                                       2 
 M                                       1 
 M                                       2 
 F                                          3 
 M                                       2 
 M                                       3 
 F                                          3 
 ....   
 我用   
 select   section,   count(*)   as   MaleNum   from   table 
 group   by   section 
 having   Gender   =    'M '   
 求每个班的男生数量,可是好像不行,语法错误。我又想不出哪里错了。。 
 帮帮忙吧!
------解决方案--------------------create table T(Gender char(1), [Section] int) 
 insert T select  'M ',             1 
 union all select  'M ',             1 
 union all select  'F ',             1 
 union all select  'F ',             2 
 union all select  'M ',             2 
 union all select  'M ',             1 
 union all select  'M ',             2 
 union all select  'F ',             3 
 union all select  'M ',             2 
 union all select  'M ',             3 
 union all select  'F ',             3 
 union all select  'F ', 			  4 --新加的记录  	 
 select distinct [Section], 
 MaleNum=(select count(*) from T where [Section]=tmp.[Section] and Gender= 'M ') 
 from T as tmp   
 --result 
 Section     MaleNum      
 ----------- -----------  
 1           3 
 2           3 
 3           1 
 4           0   
 (4 row(s) affected)