Table column string into Oracle turn

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1. Using Regular Expressions

2. With DB Function realization

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1, using regular expressions

WITH tb AS
 (SELECT '0,1,2,3,4,5,6,7,8' i_name
    FROM dual)
SELECT regexp_substr(i_name, '[^,]+', 1, LEVEL) COLUMN_VALUE
  FROM tb
CONNECT BY PRIOR dbms_random.value IS NOT NULL
       AND LEVEL <= length(i_name) - length(REPLACE(i_name, ',', '')) + 1;

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2, achieved by means of DB Function

-- DB function
CREATE OR REPLACE FUNCTION STRINGTOVARCHARTABLE ( inputList in varchar2 ) return VarcharTableType
 as
 v_str long default inputList || ',';
 v_n varchar2(4000);
 v_data VarcharTableType := VarcharTableType();
 begin
  loop
   v_n :=instr( v_str, ',' );
 exit when (v_n is null);
 v_data.extend;
  v_data( v_data.count ) := ltrim(rtrim(substr(v_str,1,v_n-1)));
 v_str := substr( v_str, v_n+1 );
  end loop;
  return v_data;
 end; 

SELECT DISTINCT (COLUMN_VALUE)
  FROM TABLE(STRINGTONUMBERTABLE('0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23'))