SQL Server 2012：如何在條件成1列時加入2個案例？

Question

我需要一些幫助來查詢。我有一個具有以下信息的表格：

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我需要分配一個點系統，每一個電話，通話不到1分鐘，1至5分鐘之間的通話，來電5至10分鐘，最後調用了10分鐘

目前我的查詢是這樣的：

Select distinct convert (date,AIV.PSEndTime,102) as TRXDATE 
,AIV.Username 
,AIV.FirstName+' '+AIV.LastName as Agent_Name 
,AIV.ITypeDisplayValue 
,convert (datetime,AIV.PSBeginTime,120) as PSBeginTime 
,convert (datetime,AIV.PSEndTime,120) as PSEndTime 
,convert(CHAR(8),DATEADD(second,AIV.Talking,0),108) as [Talking] 
,CASE WHEN AIV.Talking <='60' THEN 1 ELSE 0 end as Less_than_1min 
,CASE WHEN AIV.Talking between '61' and '300' THEN 1 ELSE 0 end as Between_1_and_5_min 
,CASE WHEN AIV.Talking between '301' and '600' THEN 1 ELSE 0 end as Between_5_and_10_min 
,CASE WHEN AIV.Talking >='601' THEN 1 ELSE 0 END as More_than_10min 

From AgentInteractionsView as AIV WITH (NOLOCK) 

WHere UserName in ('TomE','MicDe','JulCa') 
and AIV.PSBeginTime > '2017-08-01' 
and AIV.PSEndTime < '2017-09-01' 
group by 
convert (date,AIV.PSEndTime,102) 
    ,AIV.Username 
,AIV.FirstName+' '+AIV.LastName 
,AIV.ITypeDisplayValue,AIV.DIDisplayValue 
,convert (datetime,(DATEADD(hour,2,AIV.PSBeginTime)),120) 
,convert (datetime,(DATEADD(hour,2,AIV.PSEndTime)),120) 
,convert(CHAR(8),DATEADD(second,AIV.Talking,0),108) 
,AIV.Talking 

而且然而這實際工作我注意到，當柱「會說話」，所以我增加了一個新的是空它不會給我一個結果查詢：

,CASE WHEN AIV.Talking <='60' THEN 1 ELSE 0 end as Less_than_1min 
,CASE WHEN AIV.Talking = null THEN 1 ELSE 0 end as Less_than_1min 

希望這些會導致單個列，但當然它給了我2列具有相同的標題。

我想這兩個查詢連接成1列，例如

,CASE WHEN AIV.Talking = null THEN 1 
ELSE (CASE WHEN AIV.Talking <='60' THEN 1 ELSE 0) end 
as Less_than_1min 

我思念的東西（顯然）還是我從SQL :)期待太多

Answer 1

感謝您的幫助，我能弄清楚我做錯了什麼。

隨着時間的和整數顯示秒數我來到這個解決方案:)

Select CASE WHEN AIV.Talking <='60' THEN 1 ELSE 0 end as Less_than_1min 
,CASE WHEN AIV.Talking between '61' and '300' THEN 1 ELSE 0 end as Between_1_and_5_min , 
CASE WHEN AIV.Talking between '301' and '600' THEN 1 ELSE 0 end as Between_5_and_10_min 
,CASE WHEN AIV.Talking >='601' THEN 1 ELSE 0 END as More_than_10min 

我真的希望這可以幫助其他人在未來:)

Answer 2

正如我提到我評論，則可以使用ISNULL或聚結以處理一個NULL值，例如碼：

DECLARE @time TIME; 
SET  @time = NULL; 

SELECT CASE WHEN COALESCE(@time,'00:00:01') <= '00:01:00' THEN 1 ELSE 0 END AS Test_Time; 

上面的代碼返回1，一樣：

DECLARE @time TIME; 
SET  @time = '00:00:01'; 

SELECT CASE WHEN COALESCE(@time,'00:00:01') <= '00:01:00' THEN 1 ELSE 0 END AS Test_Time; 

及以下的返回一個0：

DECLARE @time TIME; 
SET  @time = '00:02:01'; 

SELECT CASE WHEN COALESCE(@time,'00:00:01') <= '00:01:00' THEN 1 ELSE 0 END AS Test_Time; 

一樣：

DECLARE @time TIME; 
SET  @time = NULL; 

SELECT CASE WHEN @time <= '00:01:00' THEN 1 ELSE 0 END AS Test_Time; 

由於值爲NULL，它無法評估，所以返回false。

所以當使用COALESCE時，我只是確保我設置的值是NULL，如果它符合CASE表達式邏輯，則返回我需要的值。