CREATE GLOBAL TEMPORARY ( )
ON COMMIT PRESERVE ROWS；

CREATE GLOBAL TEMPORARY ( )
ON COMMIT DELETE ROWS；
CREATE GLOBAL TEMPORARY TABLE MyTempTable

create or replace procedure pro_temp(v_col1 varchar2,v_col2 varchar2) as
v_num number;
begin
select count(*) into v_num from
user_tables where table_name=''T_TEMP'';　　
--create temporary table
if v_num<1 then
execute immediate ''CREATE GLOBAL TEMPORARY TABLE T_TEMP (
COL1 VARCHAR2(10),
COL2 VARCHAR2(10)
) ON COMMIT delete ROWS'';
end if;　　
--insert data
execute immediate ''insert into t_temp values
(''''''　　v_col1　　'''''',''''''　　v_col2　　'''''')'';　　
execute immediate ''select col1 from t_temp'' into v_num;
dbms_output.put_line(v_num);
execute immediate ''delete from t_temp'';
commit;
execute immediate ''drop table t_temp'';
end pro_temp;　

15:23:54 SQL> set serveroutput on
15:24:01 SQL> exec pro_temp(''11'',''22'');
11　　
PL/SQL 过程已成功完成。　　
已用时间: 00: 00: 00.79
15:24:08 SQL> desc t_temp;
ERROR：
ORA-04043: 对象 t_temp 不存在