Question

can anyone help me on why the WHERE clause if not functioning? And what is the alternative solution on it?

SELECT jq.jobid
  FROM jobqueue jq
  LEFT JOIN taskslogs tl
    ON jq.taskqueueid=tl.taskqueueid
  LEFT JOIN (SELECT p1.taskID,p1.processingType
               FROM projecttask p
               LEFT JOIN projecttask p1
                 ON p.sequenceNo=p1.nextTaskSequence
                AND p.projectID=p1.projectID
              WHERE p.taskID=paramTaskID) prevTask
    ON tl.taskID=prevTask.taskID
 WHERE IF(prevTask.processingType='BATCH',jq.batchid!=0,IF(prevTask.processingType='DOCGROUP',jq.documentgroupid!=0,TRUE))
 GROUP BY jq.jobid

Answer 1

Maybe something like this:

WHERE 
    (prevTask.processingType='BATCH' AND jq.batchid!=0)
    OR (prevTask.processingType='DOCGROUP' AND jq.documentgroupid!=0)