求汇总统计的SQL写法
各位朋友！请教一个SQL写法，有个表里面有,（回访日期，很好，较好，一般，接车，机电，钣金，美容，销售）等字段，除“回访日期”外其它字段类型都是"BIT" 现在想，统计一个是间段内，的（很好，较好，一般，接车，机电，钣金，美容，销售）等字段值为"true"的统计汇总，该如何写？谢谢，请各位帮忙看看！ 就剩35分了，请帮忙，发完贴，去挣分！
[解决办法]
select sum(case 很好 when 1 then 1 else 0 end) as sum_很好，
sum(case 较好 when 1 then 1 else 0 end) as sum_较好，
sum(case 一般 when 1 then 1 else 0 end) as sum_一般，
sum(case 接车 when 1 then 1 else 0 end) as sum_接车，
sum(case 机电 when 1 then 1 else 0 end) as sum_机电，
sum(case 钣金 when 1 then 1 else 0 end) as sum_钣金，
sum(case 美容 when 1 then 1 else 0 end) as sum_美容，
sum(case 销售 when 1 then 1 else 0 end) as sum_销售 from table
delcare @datetimefrom datetime,@datetimeto datetime
select @datetimefrom ='2013-05-01', @datetimeto ='2013-05-30',
select sum(case 很好 when 1 then 1 else 0 end) as sum_很好，
sum(case 较好 when 1 then 1 else 0 end) as sum_较好，
sum(case 一般 when 1 then 1 else 0 end) as sum_一般，
sum(case 接车 when 1 then 1 else 0 end) as sum_接车，
sum(case 机电 when 1 then 1 else 0 end) as sum_机电，
sum(case 钣金 when 1 then 1 else 0 end) as sum_钣金，
sum(case 美容 when 1 then 1 else 0 end) as sum_美容，
sum(case 销售 when 1 then 1 else 0 end) as sum_销售 from table
where 回访日期> @datetimefrom and 回访日期< @datetimeto
delcare @datetimefrom datetime,@datetimeto datetime
select @datetimefrom ='2013-05-01', @datetimeto ='2013-05-30',
select (select count(很好) from table where 很好=1) as sum_很好，
(select count(较好) from table where 较好=1) as sum_较好
....
