SQL syntax error in case statement inside sum function

Question

Below is my code:

SELECT HOUR(asl.Start_Time) AS [Hour],
       t.team_name,
       SUM( CASE WHEN asl.Working = 1 
                 THEN asl.Duration_Seconds 
                 ELSE 0 END) 
           AS TotalSeconds
FROM (Agents 
         INNER JOIN Teams AS t 
         ON Agents.team_no = Teams.team_no)
      INNER JOIN AgentStateLogs AS asl 
      ON Agents.agent_no = asl.Agent_No
GROUP BY t.team_name, HOUR(asl.Start_Time);

The problem is that it is saying there is a missing operator in the statement:

SUM( CASE WHEN asl.Working = 1 
          THEN asl.Duration_Seconds 
          ELSE 0 END) 
    AS TotalSeconds

Ive been trying to find it and I just cant see where the error lies. Can anyone shed some light on this for me? This code is being done in MS Access 2013.

Thank you in advance.

Answer 1

CASE WHEN asl.Working = 1 
THEN asl.Duration_Seconds 
ELSE 0 END

Translated to JET, this becomes

IIf(asl.Working = 1, asl.Duration_Seconds, 0)

Search for immediate if in the manual for more information.