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下面是我的 SQL 查询...然而，我的平均值不是对总数进行平均，而只是显示 SUM。我不知道为什么。任何人都可以提供任何见解吗？

   SELECT
AVG(a.t1) as '8:00-9:00',
AVG(a.t2) as '9:00-10:00',
AVG(a.t3) as '10:00-11:00',
AVG(a.t4) as '11:00-12:00',
AVG(a.t5) as '12:00-1:00',
AVG(a.t6) as '1:00-2:00',
AVG(a.t7) as '2:00-3:00',
AVG(a.t8) as '3:00-4:00',
AVG(a.t9) as '4:00-5:00',
AVG(a.t10) '5:00-6:00',
AVG(a.t11) as '6:00-7:00',
AVG(a.t12) as '7:00-8:00' 
from 
(select COUNT(Case when CAST(Request_Datetime AS time) BETWEEN CAST('07:00:00' AS time) AND CAST('08:00:00' AS time) then 1 end) as t1,
 COUNT(Case when CAST(Request_Datetime AS time)BETWEEN CAST('08:00:00' AS time) AND CAST('09:00:00' AS time) then 1 end) as t2,
 COUNT(Case when CAST(Request_Datetime AS time) BETWEEN CAST('10:00:00' AS time) AND CAST('11:00:00' AS time) then 1 end) as t3,
 COUNT(Case when CAST(Request_Datetime AS time) BETWEEN CAST('11:00:00' AS time) AND CAST('12:00:00' AS time) then 1 end) as t4,
 COUNT(Case when CAST(Request_Datetime AS time) BETWEEN CAST('12:00:00' AS time) AND CAST('13:00:00' AS time) then 1 end) as t5,
 COUNT(Case when CAST(Request_Datetime AS time) BETWEEN CAST('13:00:00' AS time) AND CAST('14:00:00' AS time) then 1 end) as t6,
 COUNT(Case when CAST(Request_Datetime AS time) BETWEEN CAST('14:00:00' AS time) AND CAST('15:00:00' AS time) then 1 end) as t7,
 COUNT(Case when CAST(Request_Datetime AS time) BETWEEN CAST('15:00:00' AS time) AND CAST('16:00:00' AS time) then 1 end) as t8,
 COUNT(Case when CAST(Request_Datetime AS time) BETWEEN CAST('16:00:00' AS time) AND CAST('17:00:00' AS time) then 1 end) as t9,
 COUNT(Case when CAST(Request_Datetime AS time) BETWEEN CAST('17:00:00' AS time) AND CAST('18:00:00' AS time) then 1 end) as t10,
 COUNT(Case when CAST(Request_Datetime AS time) BETWEEN CAST('18:00:00' AS time) AND CAST('19:00:00' AS time) then 1 end) as t11,
 COUNT(Case when CAST(Request_Datetime AS time) BETWEEN CAST('19:00:00' AS time) AND CAST('20:00:00' AS time) then 1 end) as t12 ,
 COUNT(Interaction_ID) as dayCount
 from rt_queue_delta 
 Where DateName( dw,Request_datetime) in('Monday','Tuesday','Wednesday','Thursday','Friday','Saturday') and  
 CAST(Request_datetime as Date) >= '05/01/2015' and Department = 1) as a
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2 回答 2

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您有一个隐式 GROUP BY 在子查询中执行 COUNT，然后对单个值（COUNT）进行 AVG，因此基本上在您的查询中 AVG 是无操作的。

丢弃外部查询并在子查询中计算 AVG 而不是 COUNT：

计数（当 VAL BETWEEN... THEN 1 END 时的情况）

应该成为

AVG（当 VAL BETWEEN... THEN VAL END 时的情况）

于 2016-06-01T22:36:26.993 回答
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我怀疑您想要的查询是：

select AVG(Case when CAST(Request_Datetime AS time) BETWEEN CAST('07:00:00' AS time) AND CAST('08:00:00' AS time) then 1.0 else 0 end) as t1,
       . . .
       AVG(Case when CAST(Request_Datetime AS time) BETWEEN CAST('19:00:00' AS time) AND CAST('20:00:00' AS time) then 1.0 else 0 end) as t12 ,
       COUNT(Interaction_ID) as dayCount
 from rt_queue_delta 
 Where DateName(dw, Request_datetime) in ('Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday') and  
       CAST(Request_datetime as Date) >= '2015-05-01' and
       Department = 1;

这将返回每个时间段内占总数的比例。注意 和 的1.0使用else 0。

于 2016-06-01T22:54:37.990 回答