Question

The following query works in MS Access, but it does not work in MS SQL Server:

SELECT
  tblSession.PatientID as PID,
  max(tblSession.SessionAttend) - 
    min(tblSession.SessionAttend) + 1 as NumSA,
  max(tblSession.SessionSched) - 
    min(tblSession.SessionSched) + 1 as NumSS FROM
  (
    SELECT top 100 percent
      tblSession.PatientID,
      tblSession.SessionNumber,
      tblSession.SessionDate,
      tblSession.SessionAttend,
      tblSession.SessionSched FROM
      tblPatient INNER JOIN tblSession ON
        tblPatient.PatientID = tblSession.PatientID) WHERE
        (tblSession.SessionDate >= '12/8/2010') AND
        (tblSession.SessionDate <= '5/18/2011') AND
        (tblSession.Status = '2') ORDER BY 
          tblSession.PatientID, tblSession.SessionNumber
  ) GROUP BY tblSession.PatientID

In SQL Server, it gives the error “Incorrect syntax near the keyword ‘GROUP’.” When I hover over the GROUP keyword, the tooltip displays “Incorrect syntax near ‘GROUP’. Expecting AS, ID, or QUOTED_ID.” I don’t understand. Can anyone tell me how to make this query work?

Answer 1

The derived table in () needs an alias, and its column references in the SELECT list updated accordingly:

SELECT top 100 percent
  ALIASNAME.PatientID as PID,
  max(ALIASNAME.SessionAttend) - 
    min(ALIASNAME.SessionAttend) + 1 as NumSA,
  max(ALIASNAME.SessionSched) - 
    min(ALIASNAME.SessionSched) + 1 as NumSS FROM
  (
    SELECT top 100 percent
      tblSession.PatientID,
      ...
      ...
      ...
      ...
          tblSession.PatientID, tblSession.SessionNumber
  -- This derived table needs an alias
  ) ALIASNAME 
  GROUP BY ALIASNAME.PatientID