sql server - String concatenation issue in CTE SQL -

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i have following cte sql

with tasks (     select     taskid, parenttaskid, cast(sortkey nchar) sort_key                /*,cast(sortkey char) sort_key */           oatasks s          (taskid = 1)       union       select   s2.taskid, s2.parenttaskid                ,cast( '0.'+ cast(tasks_2.sort_key nchar)                  + '0.' + cast(s2.sortkey nchar) nchar) sort_key                /*,cast(tasks_2.sort_key +'.'+ cast(s2.sortkey char) char)*/           oatasks s2       inner join tasks tasks_2          on tasks_2.taskid = s2.parenttaskid ) select  tasks_1.taskid, oatasks.task, oatasks.parenttaskid         , oatasks.sortkey,tasks_1.sort_key    tasks tasks_1   inner join oatasks on tasks_1.taskid = oatasks.taskid

in sort_key column not getting desired format should 01, 01.01, 01.01.01 etc. i'm getting 1, 0.1, 0.1.1. suggestion?

try right select right('00',1,2) gives 01


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