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根据16进制查字符:
select chr(to_number('2F','xx')) from dual --/
select chr(to_number('3D','xx')) from dual --=
select chr(to_number('26','xx')) from dual --&
select chr(to_number('3F','xx')) from dual --?
select chr(to_number('3A','xx')) from dual --:
根据字符查16进制:
select to_char(ascii('/'),'XX') from dual --2F
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