sql server - updating a column using cursor having loops -


i have table 

| code | descd | slnum | |------|-------|-------| | 10   |     | 0     | | 10   | b     | 0     | | 12   | c     | 0     | | 12   | d     | 0     | | 11   | e     | 0     | | 11   | f     | 0     |

and have update slnum column using cursor having loops

| code | descd | slnum | |------|-------|-------| | 10   |     | 1     | | 10   | b     | 2     | | 12   | c     | 1     | | 12   | d     | 2     | | 11   | e     | 1     | | 12   | f     | 3     |

how resolve this? have tried not giving me correct output 

declare @value int   declare @s int=1     declare scursor  cursor    select slnum   trec    update of slnum    open scursor    fetch next scursor   @value    while @@fetch_status = 0   begin       if exists(select * trec) -- missing       begin       update trec       set slnum=@s       current of scursor       select @s=@s+1       end       else        begin       update trec       set slnum=@s               current of scursor       end       fetch next scursor @value   end    close scursor   deallocate scursor

i don't know whether or not must use cursor, query dead ringer update join, using row_number:

update t1 set     slnum = t2.slnum     yourtable t1 inner join (     select code,            descd,            row_number() over(partition code order descd) slnum     yourtable ) t2     on t1.code = t2.code ,        t1.descd = t2.descd

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