1.在将row_val变量char值’Good’更新到表中时，得到无效的标识符错误2.在插入数字时，它工作正常，但字符串却出现错误3。

declare
    count_temp number;
    csv_data varchar2(1000);
    val varchar2(100);
    row_val varchar2(100);
    sqlcmd varchar2(3000);
    col_name varchar2(100);
    col_data varchar2(100);
begin
    csv_data:='good,son,r,,happy';
    col_data:='varchar2(100)';
    select regexp_count(csv_data, ',') + 1 into count_temp from dual;
    dbms_output.put_line(count_temp);
  sqlcmd := 'create table test(id number GENERATED ALWAYS as IDENTITY(START with 1 INCREMENT by 1))';
    DBMS_OUTPUT.PUT_LINE(sqlcmd);
    execute immediate sqlcmd;
    for i in 1..count_temp loop
        col_name:='column_'||''||i;

        sqlcmd := 'alter table test add '||col_name||' '||col_data;  
            DBMS_OUTPUT.PUT_LINE(sqlcmd);
            execute immediate sqlcmd;


     sqlcmd:='insert into test ('||col_name||') values('||i||')';

     DBMS_OUTPUT.PUT_LINE(sqlcmd);
      execute immediate sqlcmd;
    sqlcmd:='update test  set '||col_name||'='||i||' where id=1';    
   DBMS_OUTPUT.PUT_LINE(sqlcmd);
   execute immediate sqlcmd;
    sqlcmd:='delete from test   where id > 1';    
    DBMS_OUTPUT.PUT_LINE(sqlcmd);
      execute immediate sqlcmd;
    end loop;
    for i in 1..count_temp
     loop
        col_name:='column_'||''||i;
        select regexp_substr(csv_data, '(.*?)(,|$)',1,i, NULL, 1) into val from dual;
        row_val:=val;
      --in this update statement getting errors    
        sqlcmd:='update test  set '||col_name||'='||to_char(row_val)||' where id=1';    
       -- DBMS_OUTPUT.PUT_LINE(sqlcmd);
        execute immediate sqlcmd;

        DBMS_OUTPUT.put(val||'  ');

     end loop;
    dbms_output.new_line;
end;
/

错误

ORA-00904：“良好”：标识符无效ORA-06512：在第43行ORA-06512：在“ SYS.DBMS_SQL”在第1721行

我想将此’good，son，r ,, happy’字符串中的每个单词插入一行中的单独列中