SQL> set timing on
SQL> select * from forums where forumno in ('1','2','3');FO FORUMNAME                                                 NUM      RENUM
-- -------------------------------------------------- ---------- ----------
MANAGER
--------------------
1  求医问药                                                   17         31
beckham2  父母论坛                                                    5         11
bobo3  健康与性                                                    3          6
欧公
已用时间:  00: 00: 00.10
--------------------------
SQL> set timing on
SQL> select * from forums where forumno='1' or forumno='2' or forumno='3';FO FORUMNAME                                                 NUM      RENUM
-- -------------------------------------------------- ---------- ----------
MANAGER
--------------------
1  求医问药                                                   17         31
beckham2  父母论坛                                                    5         11
bobo3  健康与性                                                    3          6
欧公
已用时间:  00: 00: 00.10