多个案例陈述的最小值答案

【问题标题】：Min of multiple case statements多个案例陈述的最小值
【发布时间】：2014-11-26 19:28:01
【问题描述】：

使用 SSMS 2012 但使用 SQL Server 2000。

我有一个查询，其中包含通过冗长的案例语句计算的 4 列。我需要再添加一列来显示这 4 列中的最小值。在最终形式中，只要最后一列具有最小值，就不需要 4 列保留在结果中。以下是我当前使用的代码以及结果示例。在结果样本中，我已经包含了我想要的 Final Tier col。我也是 SQL 新手，所以如果有更简洁的方法来完成同样的任务，请随时教我。 :)

Select 
,Round(Sum(S.TWin)/Nullif(Count(Distinct S.GamingDate),0),2) as ADT
,Round(Sum(S.Twin)/Nullif(count(Distinct Month(S.GamingDate)),0),2) as AMT
,Round(((Sum(case when S.StatType = 'Slot' then S.CashIn - S.CashOut - S.JackPot Else 0 end)+
  Sum(case when S.StatType = 'Pit' then S.CashIn + S.ChipsIn + S.FrontIn + S.CreditIn - S.CashOut Else 0 end))/Count(Distinct S.GamingDate)),2) as ADL
,Round(((Sum(case when S.StatType = 'Slot' then S.CashIn - S.CashOut - S.JackPot Else 0 end)+
  Sum(case when S.StatType = 'Pit' then S.CashIn + S.ChipsIn + S.FrontIn + S.CreditIn - S.CashOut Else 0 end))/count(Distinct Month(S.GamingDate))),2) as AML

,case 
    when Round(Sum(S.TWin)/Nullif(Count(Distinct S.GamingDate),0),2) between 3500 and 1000000 then '1'
    when Round(Sum(S.TWin)/Nullif(Count(Distinct S.GamingDate),0),2) between 2000 and 3499.99 then '2'
    when Round(Sum(S.TWin)/Nullif(Count(Distinct S.GamingDate),0),2) between 1500 and 1999.99 then '3'
    when Round(Sum(S.TWin)/Nullif(Count(Distinct S.GamingDate),0),2) between 1000 and 1499.99 then '4'
    when Round(Sum(S.TWin)/Nullif(Count(Distinct S.GamingDate),0),2) between 750  and 999.99  then '5'
    when Round(Sum(S.TWin)/Nullif(Count(Distinct S.GamingDate),0),2) between 500  and 749.99  then '6'
    when Round(Sum(S.TWin)/Nullif(Count(Distinct S.GamingDate),0),2) between 300  and 499.99  then '7'
    when Round(Sum(S.TWin)/Nullif(Count(Distinct S.GamingDate),0),2) between 150  and 299.99  then '8'
    when Round(Sum(S.TWin)/Nullif(Count(Distinct S.GamingDate),0),2) between 75   and 149.99  then '9'
    when Round(Sum(S.TWin)/Nullif(Count(Distinct S.GamingDate),0),2) between 40   and 74.99   then '10'
    when Round(Sum(S.TWin)/Nullif(Count(Distinct S.GamingDate),0),2) between 15   and 39.99   then '11'
    Else null
End as "ADT Tier"
,case
    when Round(Sum(S.Twin)/Nullif(count(Distinct Month(S.GamingDate)),0),2) between 21000 and 1000000 then '1'
    when Round(Sum(S.Twin)/Nullif(count(Distinct Month(S.GamingDate)),0),2) between 12000 and 20999   then '2'
    when Round(Sum(S.Twin)/Nullif(count(Distinct Month(S.GamingDate)),0),2) between 9000  and 11999   then '3'
    when Round(Sum(S.Twin)/Nullif(count(Distinct Month(S.GamingDate)),0),2) between 6000  and 8999    then '4'
    when Round(Sum(S.Twin)/Nullif(count(Distinct Month(S.GamingDate)),0),2) between 4500  and 5999    then '5'
    when Round(Sum(S.Twin)/Nullif(count(Distinct Month(S.GamingDate)),0),2) between 3000  and 4499    then '6'
    when Round(Sum(S.Twin)/Nullif(count(Distinct Month(S.GamingDate)),0),2) between 1800  and 2999    then '7'
    when Round(Sum(S.Twin)/Nullif(count(Distinct Month(S.GamingDate)),0),2) between 900   and 1799    then '8'
    when Round(Sum(S.Twin)/Nullif(count(Distinct Month(S.GamingDate)),0),2) between 450   and 899     then '9'
    when Round(Sum(S.Twin)/Nullif(count(Distinct Month(S.GamingDate)),0),2) between 240   and 349     then '10'
    when Round(Sum(S.Twin)/Nullif(count(Distinct Month(S.GamingDate)),0),2) between 90    and 239     then '11'
    Else null
End as "AMT Tier"
,case
    when Round(((Sum(case when S.StatType = 'Slot' then S.CashIn - S.CashOut - S.JackPot Else 0 end)+
         Sum(case when S.StatType = 'Pit' then S.CashIn + S.ChipsIn + S.FrontIn + S.CreditIn - S.CashOut Else 0 end))/Count(Distinct S.GamingDate)),2)
         between 3500 and 1000000 then '1'

    when Round(((Sum(case when S.StatType = 'Slot' then S.CashIn - S.CashOut - S.JackPot Else 0 end)+
         Sum(case when S.StatType = 'Pit' then S.CashIn + S.ChipsIn + S.FrontIn + S.CreditIn - S.CashOut Else 0 end))/Count(Distinct S.GamingDate)),2)
         between 2000 and 3499.99 then '2'

    when Round(((Sum(case when S.StatType = 'Slot' then S.CashIn - S.CashOut - S.JackPot Else 0 end)+
         Sum(case when S.StatType = 'Pit' then S.CashIn + S.ChipsIn + S.FrontIn + S.CreditIn - S.CashOut Else 0 end))/Count(Distinct S.GamingDate)),2)
         between 1500 and 1999.99 then '3'

    when Round(((Sum(case when S.StatType = 'Slot' then S.CashIn - S.CashOut - S.JackPot Else 0 end)+
         Sum(case when S.StatType = 'Pit' then S.CashIn + S.ChipsIn + S.FrontIn + S.CreditIn - S.CashOut Else 0 end))/Count(Distinct S.GamingDate)),2)
         between 1000 and 1499.99 then '4'

    when Round(((Sum(case when S.StatType = 'Slot' then S.CashIn - S.CashOut - S.JackPot Else 0 end)+
         Sum(case when S.StatType = 'Pit' then S.CashIn + S.ChipsIn + S.FrontIn + S.CreditIn - S.CashOut Else 0 end))/Count(Distinct S.GamingDate)),2)
         between 750  and 999.99  then '5'

    when Round(((Sum(case when S.StatType = 'Slot' then S.CashIn - S.CashOut - S.JackPot Else 0 end)+
         Sum(case when S.StatType = 'Pit' then S.CashIn + S.ChipsIn + S.FrontIn + S.CreditIn - S.CashOut Else 0 end))/Count(Distinct S.GamingDate)),2)
         between 500  and 749.99  then '6'

    when Round(((Sum(case when S.StatType = 'Slot' then S.CashIn - S.CashOut - S.JackPot Else 0 end)+
         Sum(case when S.StatType = 'Pit' then S.CashIn + S.ChipsIn + S.FrontIn + S.CreditIn - S.CashOut Else 0 end))/Count(Distinct S.GamingDate)),2)
         between 300  and 499.99  then '7'

    when Round(((Sum(case when S.StatType = 'Slot' then S.CashIn - S.CashOut - S.JackPot Else 0 end)+
         Sum(case when S.StatType = 'Pit' then S.CashIn + S.ChipsIn + S.FrontIn + S.CreditIn - S.CashOut Else 0 end))/Count(Distinct S.GamingDate)),2)
         between 150  and 299.99  then '8'

    when Round(((Sum(case when S.StatType = 'Slot' then S.CashIn - S.CashOut - S.JackPot Else 0 end)+
         Sum(case when S.StatType = 'Pit' then S.CashIn + S.ChipsIn + S.FrontIn + S.CreditIn - S.CashOut Else 0 end))/Count(Distinct S.GamingDate)),2)
         between 75   and 149.99  then '9'

    when Round(((Sum(case when S.StatType = 'Slot' then S.CashIn - S.CashOut - S.JackPot Else 0 end)+
         Sum(case when S.StatType = 'Pit' then S.CashIn + S.ChipsIn + S.FrontIn + S.CreditIn - S.CashOut Else 0 end))/Count(Distinct S.GamingDate)),2)
         between 40   and 74.99   then '10'

    when Round(((Sum(case when S.StatType = 'Slot' then S.CashIn - S.CashOut - S.JackPot Else 0 end)+
         Sum(case when S.StatType = 'Pit' then S.CashIn + S.ChipsIn + S.FrontIn + S.CreditIn - S.CashOut Else 0 end))/Count(Distinct S.GamingDate)),2)
         between 15   and 39.99   then '11'

    Else null
End as "ADL Tier"
,case
    when Round(((Sum(case when S.StatType = 'Slot' then S.CashIn - S.CashOut - S.JackPot Else 0 end)+
         Sum(case when S.StatType = 'Pit' then S.CashIn + S.ChipsIn + S.FrontIn + S.CreditIn - S.CashOut Else 0 end))/count(Distinct Month(S.GamingDate))),2)
         between 21000 and 1000000 then '1'

    when Round(((Sum(case when S.StatType = 'Slot' then S.CashIn - S.CashOut - S.JackPot Else 0 end)+
         Sum(case when S.StatType = 'Pit' then S.CashIn + S.ChipsIn + S.FrontIn + S.CreditIn - S.CashOut Else 0 end))/count(Distinct Month(S.GamingDate))),2)
         between 12000 and 20999   then '2'

    when Round(((Sum(case when S.StatType = 'Slot' then S.CashIn - S.CashOut - S.JackPot Else 0 end)+
         Sum(case when S.StatType = 'Pit' then S.CashIn + S.ChipsIn + S.FrontIn + S.CreditIn - S.CashOut Else 0 end))/count(Distinct Month(S.GamingDate))),2)
         between 9000  and 11999   then '3'

    when Round(((Sum(case when S.StatType = 'Slot' then S.CashIn - S.CashOut - S.JackPot Else 0 end)+
         Sum(case when S.StatType = 'Pit' then S.CashIn + S.ChipsIn + S.FrontIn + S.CreditIn - S.CashOut Else 0 end))/count(Distinct Month(S.GamingDate))),2)
         between 6000  and 8999    then '4'

    when Round(((Sum(case when S.StatType = 'Slot' then S.CashIn - S.CashOut - S.JackPot Else 0 end)+
         Sum(case when S.StatType = 'Pit' then S.CashIn + S.ChipsIn + S.FrontIn + S.CreditIn - S.CashOut Else 0 end))/count(Distinct Month(S.GamingDate))),2)
         between 4500  and 5999    then '5'

    when Round(((Sum(case when S.StatType = 'Slot' then S.CashIn - S.CashOut - S.JackPot Else 0 end)+
         Sum(case when S.StatType = 'Pit' then S.CashIn + S.ChipsIn + S.FrontIn + S.CreditIn - S.CashOut Else 0 end))/count(Distinct Month(S.GamingDate))),2)
         between 3000  and 4499    then '6'

    when Round(((Sum(case when S.StatType = 'Slot' then S.CashIn - S.CashOut - S.JackPot Else 0 end)+
         Sum(case when S.StatType = 'Pit' then S.CashIn + S.ChipsIn + S.FrontIn + S.CreditIn - S.CashOut Else 0 end))/count(Distinct Month(S.GamingDate))),2)
         between 1800  and 2999    then '7'

    when Round(((Sum(case when S.StatType = 'Slot' then S.CashIn - S.CashOut - S.JackPot Else 0 end)+
         Sum(case when S.StatType = 'Pit' then S.CashIn + S.ChipsIn + S.FrontIn + S.CreditIn - S.CashOut Else 0 end))/count(Distinct Month(S.GamingDate))),2)
         between 900   and 1799    then '8'

    when Round(((Sum(case when S.StatType = 'Slot' then S.CashIn - S.CashOut - S.JackPot Else 0 end)+
         Sum(case when S.StatType = 'Pit' then S.CashIn + S.ChipsIn + S.FrontIn + S.CreditIn - S.CashOut Else 0 end))/count(Distinct Month(S.GamingDate))),2)
         between 450   and 899     then '9'

    when Round(((Sum(case when S.StatType = 'Slot' then S.CashIn - S.CashOut - S.JackPot Else 0 end)+
         Sum(case when S.StatType = 'Pit' then S.CashIn + S.ChipsIn + S.FrontIn + S.CreditIn - S.CashOut Else 0 end))/count(Distinct Month(S.GamingDate))),2)
         between 240   and 349     then '10'

    when Round(((Sum(case when S.StatType = 'Slot' then S.CashIn - S.CashOut - S.JackPot Else 0 end)+
         Sum(case when S.StatType = 'Pit' then S.CashIn + S.ChipsIn + S.FrontIn + S.CreditIn - S.CashOut Else 0 end))/count(Distinct Month(S.GamingDate))),2)
         between 90    and 239     then '11'

    Else null
End as "AML Tier"

From  dbo.CDS_STATDAY as S

Where S.GamingDate Between '06/1/2014' and '08/31/2014'
  And S.IDType = 'P'
  And S.StatType <> 'Poker'

Group by S.Meta_ID

结果

Player ID    ADT     AMT      ADL     AML      ADT Tier    AMT Tier    ADL Tier    AML Tier    Final Tier
114          498.26  4484.31  394.99  3554.90  7           6           7           6             6
144          59.42   257.50   61.46   266.34   10          10          10          10           10
316          0.29    0.29     -13.1   -13.1    NULL        NULL        NULL        NULL         NULL
573          3.09    6.18     60      120      NULL        NULL        10          11           10

我不确定这是否最好使用子查询、嵌套大小写或我什至不知道存在的东西来完成。

【问题讨论】：

您使用的是哪个 RDMS？
我是 sql 的超级新手，所以我不确定你所说的 RDMS 是什么意思，但我想你想知道我正在使用 T-SQL。

标签： sql case sql-server-2000 min

【解决方案1】：

我认为您的方法没有问题，但也许在应用程序级别而不是在查询中处理这种事情会更好。

【讨论】：

我同意这一点，但是大老板说不，他想在查询中加入。

【解决方案2】：

首先，将您的查询转换为视图。然后，在视图上创建一个新查询，其中包含已计算的字段，您可以将这些字段相互比较。

【讨论】：

好的，我会用谷歌搜索什么是视图以及如何使用它。 :)