Question : Query asking for an Expr1 as a PArameter

Hi Guys
this is the SQl query

SELECT PatientMaster.PatientID, PatientMaster.PatientCode, DiagnosisDetails.GISTDiagnosisDate,

Max(IIf(maxdate([PatientMaster].[LastUpdateDate],[PatientMaster].[LastUpdateDate],[TimeLine].[Start Date])=#1/1/1000#,"",maxdate([PatientMaster].[LastUpdateDate],[PatientMaster].[LastUpdateDate],[TimeLine].[Start Date]))) AS LastContactEvent

,


 DateDiff("d",[DiagnosisDetails].[GISTDiagnosisDate],[LastContactEvent]) AS OPSND


FROM (PatientMaster LEFT JOIN TimeLine ON PatientMaster.PatientID = TimeLine.Patient) INNER JOIN DiagnosisDetails ON PatientMaster.PatientID = DiagnosisDetails.PatientID
GROUP BY PatientMaster.PatientID, PatientMaster.PatientCode, DiagnosisDetails.GISTDiagnosisDate, DateDiff("d",[DiagnosisDetails].[GISTDiagnosisDate],[LastContactEvent]), PatientMaster.Deceased
HAVING (((PatientMaster.Deceased)=No))
ORDER BY PatientMaster.PatientID, Max(IIf(maxdate([PatientMaster].[LastUpdateDate],[PatientMaster].[LastUpdateDate],[TimeLine].[Start Date])=#1/1/1000#,"",maxdate([PatientMaster].[LastUpdateDate],[PatientMaster].[LastUpdateDate],[TimeLine].[Start Date])));


When i run this query is asking me for [LastContactEvent] as a Parameter, i hit enter and runs fine, i do not know why
i am using [LastContactEvent] as the max of 3 days i call a function that i create and return the mas of 3 dates.
in OPSND i use [LastContactEvent] to get the difference in days between [lastcontactevent] and another datefield

Any idea


best regards

Answer : Query asking for an Expr1 as a PArameter

your query needs to read:

SELECT PatientMaster.PatientID, PatientMaster.PatientCode, DiagnosisDetails.GISTDiagnosisDate, Max(IIf(maxdate([PatientMaster].[LastUpdateDate],[PatientMaster].[LastUpdateDate],[TimeLine].[Start Date])=#1/1/1000#,"",maxdate([PatientMaster].[LastUpdateDate],[PatientMaster].[LastUpdateDate],[TimeLine].[Start Date]))) AS LastContactEvent, DateDiff("d",[DiagnosisDetails].[GISTDiagnosisDate],Max(IIf(maxdate([PatientMaster].[LastUpdateDate],[PatientMaster].[LastUpdateDate],[TimeLine].[Start Date])=#1/1/1000#,"",maxdate([PatientMaster].[LastUpdateDate],[PatientMaster].[LastUpdateDate],[TimeLine].[Start Date]))) ) AS OPSND FROM (PatientMaster LEFT JOIN TimeLine ON PatientMaster.PatientID = TimeLine.Patient) INNER JOIN DiagnosisDetails ON PatientMaster.PatientID = DiagnosisDetails.PatientID
GROUP BY PatientMaster.PatientID, PatientMaster.PatientCode, DiagnosisDetails.GISTDiagnosisDate, DateDiff("d",[DiagnosisDetails].[GISTDiagnosisDate],[LastContactEvent]), PatientMaster.Deceased
HAVING (((PatientMaster.Deceased)=No))
ORDER BY PatientMaster.PatientID, Max(IIf(maxdate([PatientMaster].[LastUpdateDate],[PatientMaster].[LastUpdateDate],[TimeLine].[Start Date])=#1/1/1000#,"",maxdate([PatientMaster].[LastUpdateDate],[PatientMaster].[LastUpdateDate],[TimeLine].[Start Date])));