以前做过一道题目,一直没有来得及总结下来。贴图:

            

 

   记得以前曾经找到了两种方法,今天试了一下,还是可以的,贴出过程:

              

   下面是具体的查询方法:

    原来放的是图片,今天又练习了一下,附代码:

  

 1 create TABLE #Match
 2 (
 3 matchDate datetime,
 4 matchResult nvarchar(20)
 5 )
 6 
 7 insert #Match select '2014-09-01','lost'
 8 select '2014-09-19','win'
 9 union all
10 select '2014-09-19','win'
11 union all
12 select '2014-09-19','lost'
13 union all
14 select '2014-09-01','win'
15 union all
16 select '2014-09-19','lost'
17 union all
18 select '2014-09-01','lost'
19 
20 
21 select * from #Match
22 
23 
24 --方法1
25 select m.matchDate,
26 sum(case when m.matchResult='win' then 1 else 0 end)  win,
27 sum(case when m.matchResult='lost' then 1 else 0 end)  lost
28 from #Match m group by m.matchDate
29 
30 
31 --方法2
32 select m.matchDate,
33 sum(case m.matchResult when 'win' then 1 else 0 end)  win,
34 sum(case m.matchResult when 'lost' then 1 else 0 end)  lost
35 from #Match m group by m.matchDate
View Code

 

posted on 2014-03-06 12:00  水语者9  阅读(924)  评论(0编辑  收藏  举报