SQL语句 保留中文字符以及去掉中文字符

-- 保留或删除字符串中中文字符SQL函数

create or replace function f_deal_off_chinese(x varchar)

--去除中文字符，保留非中文字符

 return varchar as

  y varchar(4000);

begin

  for i in 1 .. length(x) loop

    if ascii(substr(x, i, 1)) <= 127 then

      y := y || substr(x, i, 1);

    end if;

  end loop;

  return y;

end f_deal_off_chinese;

create or replace function f_deal_keep_chinese(x varchar)

--保留中文字符，去除非中文字符

 return varchar as

  y varchar(4000);

begin

  for i in 1 .. length(x) loop

    if ascii(substr(x, i, 1)) > 127 then

      y := y || substr(x, i, 1);

    end if;

  end loop;

  return y;

end f_deal_keep_chinese;

--测试

with tmpTable as

 (select '我abc123' a from dual union all select 'aaa中国123' a from dual)

select f_deal_keep_chinese(a) as keep_chi,

       f_deal_off_chinese(a) as off_chi,

       a

  from tmpTable;