Update a column with sequence numbers without using ROW_NUMBER() in SQL Server -

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i have table , have difficulty updating it

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

i have update table without using row_number() using if else loops how can that?

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

for sql 2012+

    ;with rownum(code, descd, slnum) (     select 10, 'a', 0     union select 10, 'b', 0     union select 12, 'c', 0     union select 12, 'd', 0     union select 11, 'e', 0     union select 12, 'f', 0     ) select code, descd, count(*) on (partition code order code              rows unbounded preceding) rownum o order descd

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