Oracle中用SQL语句实现进制间互相转换

对其它进制可以根据例子将power的底数改成相应的进制就可以了。本文只是一个例子，大家可以把它封装成一个通用函数进行实用。大家在试的时候将里面相应的其它进制的数值换成自己的数据就可。

二进制转换十进制

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

八进制转换十进制

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

十六进制转换十进制

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'))