Question

我使用Checkin_to_triage函数计算了时间跨度变量Datediff，并希望将该变量中的值分类为新变量Pre_Arrival。我尝试使用下面的代码，但由于使用了invalid column name 'checkin_to_triage'代码，显然收到了IIf ([checkin_to_triage]<60 And [checkin_to_triage]>0,'PreArrival','Null') AS Pre_Arrival错误消息，因为Pre_Arrival变量不是我的数据集中的字段。

use EMTCQIData

DECLARE @StartDate Date
DECLARE @EndDate Date

Set @StartDate = '01/01/2018'
Set @EndDate = '12/31/2018'

SELECT *, 
  Format([CHECKIN_DATE_TIME],'dddd') AS [Checkin_Day], 
  Format([CHECKIN_DATE_TIME],'dddd dd/mm/yyyy') AS checkin_day_date, 
  CONVERT(VARCHAR(20),[CHECKIN_DATE_TIME],108) as Checkin_Time, 
  DateDiff("n",CHECKIN_DATE_TIME,triage_date_time) AS checkin_to_triage,
  IIf ([checkin_to_triage]<60 And [checkin_to_triage]>0,'PreArrival','Null') AS Pre_Arrival
FROM ED_TAT_MASTER
WHERE (CHECKIN_DATE_TIME > @StartDate and CHECKIN_DATE_TIME < @EndDate)

使用先前创建的变量创建变量

0 个答案: