在日期/時間查詢中計算大於0的值

Question

以下語句是我目前正在嘗試確定自約會日期以來已過去的天數的查詢的一部分。

, DATEDIFF(D, a.AppointmentDate, GETDATE()) as DaysSinceApptDate 

但是，我得到了負面和正面的結果。我需要更改查詢以包含正面結果。所以，任何大於0的東西都是我想要的。

我的整個查詢是：

DECLARE @StartDate DATETIME = '2014-12-1' 

    SELECT 
    ROW_NUMBER() OVER(ORDER BY ORDERS.ORDERDATE, PatientProfile.searchname) as RowNumber 
, PatientProfile.searchname as PatientName 
, PatientProfile.Birthdate 
, ORDERS.ORDERDATE as OrderDate 
, DATEDIFF(D, ORDERS.ORDERDATE, ORDERS.DB_UPDATED_DATE) AS DaysToCurrentStatus 
, ORDERS.DESCRIPTION as ReferralType 
, CASE WHEN ORDERS.STATUS = 'U' Then 'Unsigned' 
    WHEN ORDERS.STATUS = 'H' Then 'Admin Hold' 
    WHEN ORDERS.STATUS = 'S' Then 'InProcess' 
    WHEN ORDERS.STATUS = 'C' Then 'Complete' 
    WHEN ORDERS.STATUS = 'X' Then 'Cancelled' 
    ELSE NULL END AS Status 
, df.ListName as OrderingProvider 
, ORDERS.DB_UPDATED_DATE as LastUpdated 
, ORDERS.CLINCOMMENTS as Comments 
, RIGHT(RTRIM(REPLACE(REPLACE(ORDERS.CLINCOMMENTS,CHAR(10),''),CHAR(13),'')), 18) as AppointmentDate /* Get rid of carriage returns, line breaks, and trailing spaces */ 
, Coordinator = CASE 
    WHEN ORDERS.ADMINCOMMENTS like 'Leticia%' then 'Leticia' 
    WHEN ORDERS.ADMINCOMMENTS = 'Je%' then 'Jessica' 
    WHEN ORDERS.ADMINCOMMENTS = 'Da%' then 'Dahlia' 
    WHEN ORDERS.ADMINCOMMENTS = 'sandra' OR ORDERS.ADMINCOMMENTS = 'sc' THEN 'Sandra' 
    ELSE NULL END 
, LOCREG.ABBREVNAME as Location 
INTO #TEMP 
FROM (CentricityPS.dbo.PatientProfile PatientProfile 
INNER JOIN CentricityPS.dbo.ORDERS ORDERS 
    ON PatientProfile.PId=ORDERS.PID) 
INNER JOIN DoctorFacility df 
    ON ORDERS.AUTHBYUSRID = DF.PVId 
INNER JOIN CentricityPS.dbo.LOCREG LOCREG 
    ON DF.LocationId=LOCREG.LOCID 
WHERE ORDERS.ORDERDATE >= @StartDate 
    AND ORDERS.ORDERTYPE='R' /*Referral*/ 

    AND ORDERS.XID= 1000000000000000000 

    ORDER BY OrderingProvider 

/* Cast only valid dates as AppointmentDates*/ 
SELECT RowNumber, CAST(AppointmentDate as DateTime) as AppointmentDate 
INTO #Appts 
FROM #TEMP 
WHERE ISDATE(AppointmentDate) = 1 

SELECT 
    t.PatientName 
    , t.Birthdate 
    , t.OrderDate 
    , t.ReferralType 
    , t.Status 
    , t.OrderingProvider 
    , t.Comments 
    , a.AppointmentDate as AppointmentDate 
    , DATEDIFF(D, a.AppointmentDate, GETDATE()) as DaysSinceApptDate 
    , t.Coordinator 
    , t.Location 

FROM #TEMP t 
    LEFT JOIN #Appts a 
     ON a.RowNumber = t.RowNumber 

DROP TABLE #TEMP，#Appts 有沒有辦法在SQL查詢來做到這一點？

Answer 1

看起來你的桌子既有未來的約會，也有過去的約會。使用WHERE a.AppointmentDate < GETDATE()只能獲得過去約會。這將消除負面結果。