Проблема конкатенации строк в CTE SQL

Question

У меня есть следующий CTE SQL

WITH Tasks AS (
    SELECT     TaskID, ParentTaskID, CAST(SortKey AS nChar) AS sort_key
               /*,cast(SortKey as char) as sort_key */
      FROM     oaTasks AS s
      WHERE    (TaskID = 1)
      UNION ALL
      SELECT   s2.TaskID, s2.ParentTaskID
               ,Cast( '0.'+ cast(Tasks_2.sort_key as NCHAR)
                 + '0.' + cast(s2.SortKey as NCHAR) as NCHAR) AS sort_key
               /*,cast(Tasks_2.sort_key +'.'+ cast(s2.SortKey as char) as char)*/
      FROM     oaTasks AS s2
      INNER JOIN Tasks AS Tasks_2
         ON Tasks_2.TaskID = s2.ParentTaskID
)
SELECT  Tasks_1.TaskID, oaTasks.Task, oaTasks.ParentTaskID
        , oaTasks.SortKey,Tasks_1.sort_key
  FROM  Tasks AS Tasks_1
  INNER JOIN oaTasks ON Tasks_1.TaskID = oaTasks.TaskID

В столбце sort_key я не получаю желаемый формат, который должен быть похож на 01, 01.01, 01.01.01 etc., но я получаю 1, 0.1, 0.1.1. Любое предложение?

Answer 1

попробуйте ПРАВО, как выберите ПРАВО ('00', 1,2) дает 01