實用SQL統計搖獎結果

下面是搖獎概率調整後，一條實用的sql統計檢視結果：

該sql非常高效，絕對實用，不用group by 關鍵是用到case這個函式。

select  '2015-04-27  老的搖獎概率  1-11點資料',

sum(case t.result when 1 then 1 else 1 end) as 總搖獎人數, 
sum(case t.result when 1 then 1 else 0 end) as 一等獎, 
sum(case t.result when 2 then 1 else 0 end) as 二等獎, 
sum(case t.result when 3 then 1 else 0 end) as 三等獎,
sum(case t.result when 0 then 1 else 0 end) as 未中獎
from mms.mobile_ernie t 
where ernie_time>='2015-04-27 00:00:00' and ernie_time<='2015-04-27 11:00:00'
union all
select '2015-04-28 搖獎概率調整後 1-11點資料',
sum(case t.result when 1 then 1 else 1 end) as 總搖獎人數, 
sum(case t.result when 1 then 1 else 0 end) as 一等獎, 
sum(case t.result when 2 then 1 else 0 end) as 二等獎, 
sum(case t.result when 3 then 1 else 0 end) as 三等獎,
sum(case t.result when 0 then 1 else 0 end) as 未中獎
from mms.mobile_ernie t 
where ernie_time>='2015-04-28 00:00:00' and ernie_time<='2015-04-28 11:00:00'

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