Oracle中用SQL語句實現進制間互相轉換

對其它進制可以根據例子將power的底數改成相應的進制就可以了。本文只是一個例子，大家可以把它封裝成一個通用函數進行實用。大家在試的時候將里面相應的其它進制的數值換成自己的數據就可。

二進制轉換十進制

select sum(data1)from (select substr('1101', rownum, 1) * power(2, length('1101') - rownum) data1from dualconnect by rownum <= length('1101'))

八進制轉換十進制

select sum(data1)from (select substr('1101', rownum, 1) *power(8, length('1101') - rownum) data1from dualconnect by rownum <= length('1101'))

十六進制轉換十進制

select sum(data1)from (select (CASE upper(substr('2D', rownum, 1))WHEN 'A' THEN '10'WHEN 'B' THEN '11'WHEN 'C' THEN '12'WHEN 'D' THEN '13'WHEN 'E' THEN '14'WHEN 'F' THEN '15'ELSE substr('2D', rownum, 1)END) * power(16, length('2D') - rownum) data1from dualconnect by rownum <= length('2D'))