找到方法了,如下从zyz2表中随机取出两条纪录:
SQL> select * from zyz2;
ID P1 P2
---------- ---------- ----------
1 211 212
2 12 14
4 241 242
2 145
1 11
3 17 26 rows selected.Elapsed: 00:00:00.50
SQL> select id,p1,p2 from (select zyz2.*,dbms_random.random num from zyz2 order
by num) where rownum<3; ID P1 P2
---------- ---------- ----------
2 12 14
1 211 212Elapsed: 00:00:00.30
SQL> select id,p1,p2 from (select zyz2.*,dbms_random.random num from zyz2 order
by num) where rownum<3; ID P1 P2
---------- ---------- ----------
3 17 2
2 12 14
SQL> select * from zyz2;
ID P1 P2
---------- ---------- ----------
1 211 212
2 12 14
4 241 242
2 145
1 11
3 17 26 rows selected.Elapsed: 00:00:00.50
SQL> select id,p1,p2 from (select zyz2.*,dbms_random.random num from zyz2 order
by num) where rownum<3; ID P1 P2
---------- ---------- ----------
2 12 14
1 211 212Elapsed: 00:00:00.30
SQL> select id,p1,p2 from (select zyz2.*,dbms_random.random num from zyz2 order
by num) where rownum<3; ID P1 P2
---------- ---------- ----------
3 17 2
2 12 14
解决方案 »
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