Question

My query pulls records from a table based on a UserID, Priority (Yes/No), then assigns a review date based on an iif statement.

SELECT Roster.UserID, 
EventLog.Priority, 
IIf([EventLog]![Priority]=True, [EventLog]![Date], Date()-183) AS [Review Date]
FROM EventLog 
INNER JOIN Roster 
ON EventLog.UserID = Roster.UserID
GROUP BY Roster.UserID, EventLog.Priority, 
         IIf([EventLog]![Priority]=True, [EventLog]![Date], Date()-183);

As not every recory will have a priority (Yes) indicator, my query is returning both Yes and No options for those users that have a (Yes).

Query Results ex.
UserID   Priority     Review Date
abc123     Yes          5-19-2012
abc123     No           5-22-2012
qwe456     No           5-22-2012
yip552     Yes          3-10-2012
yip552     No           5-22-2012

How do I have it return only the Yes answer for those UserIDs that have one and keep the NO calculation for those that dont?

Answer 1

You should be able to use Max or Min, depending in the data stored, the word “Yes” will be Max, but the value -1 will be Min:

SELECT 
  Roster.UserID, 
  Max(EventLog.Priority), 
  Max(IIf([EventLog]![Priority]=True, [EventLog]![Date], Date()-183)) AS [Review Date]
FROM EventLog 
INNER JOIN Roster 
ON EventLog.UserID = Roster.UserID
GROUP BY Roster.UserID

You should be able to choose Expression for IIf([EventLog]![Priority]=True, [EventLog]![Date], Date()-183) AS [Review Date], so it need not be included in GROUP BY

You can choose Max for the IIf statement, too.