Operation Details
Description: reads the min and max for all planned groups for a specified parent planned group.
Sterotype: ns
SQL 
SELECT
  MIN(PlannedGroup.actualStartDate),
  MAX(PlannedGroup.actualEndDate),
  MIN(PlannedGroup.expectedStartDate),
  MAX(PlannedGroup.expectedEndDate)
INTO
  :actualStartDate,
  :actualEndDate,
  :expectedStartDate,
  :expectedEndDate 
FROM
  PlannedGroup 
WHERE PlannedGroup.parentGroupID = :plannedGroupID