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select sum(position_value) from ( select power(36,position-1) * case when digit between '0' and '9' then to_number(digit) else 10 + ascii(digit) - ascii('A') end as position_value from ( select substr(input_string,length(input_string)+1-level,1) digit, level position from (select 'A2' input_string from dual) connect by level <= length(input_string) ) )
SUM(POSITION_VALUE)
362
with t(num) as (select 362 from dual), r(md, div, lvl) as ( select mod(num, 36), floor(num/36), 1 from t union all select mod(div, 36), floor(div/36), lvl + 1 from r where div > 0) select listagg(case when md > 9 then chr(ascii('A') - 10 + md) else to_char(md) end) within group (order by lvl desc) b36 from r
B36
A2