Fixed SQL syntax issue in DeviceStatusMonitoring Task when running on PostgreSQL.

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/operation/mgt/dao/impl/OperationMappingDAOImpl.java

@@ -152,7 +152,8 @@ public class OperationMappingDAOImpl implements OperationMappingDAO {
                     "DM_DEVICE D ON E.DEVICE_ID = D.ID WHERE " +
                     "OP.STATUS IN ('"+ Operation.Status.PENDING.name() + "','" + Operation.Status.REPEATED.name() + "') " +
                     "AND OP.CREATED_TIMESTAMP BETWEEN ? AND ? AND E.STATUS IN ('" + EnrolmentInfo.Status.ACTIVE.name() +
-                    "','" + EnrolmentInfo.Status.UNREACHABLE.name() + "') AND D.DEVICE_TYPE_ID = ? GROUP BY ENROLMENT_ID";
+                    "','" + EnrolmentInfo.Status.UNREACHABLE.name() + "') AND D.DEVICE_TYPE_ID = ? GROUP BY ENROLMENT_ID," +
+                    " D.DEVICE_IDENTIFICATION, E.STATUS, E.TENANT_ID";
             stmt = conn.prepareStatement(sql);
             stmt.setLong(1, maxDuration);
             stmt.setLong(2, minDuration);