1. base64 decode
select utl_raw.cast_to_varchar2(utl_encode.base64_decode(utl_raw.cast_to_raw('dGVzdA=='))) from dual
2. base64 encode
select utl_raw.cast_to_varchar2(utl_encode.base64_encode(utl_raw.cast_to_raw('test'))) from dual
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