http://blog.sina.com.cn/s/blog_6a01140c0100wimi.html 1.从表中随机取记录 select * from (select * from staff order by dbms_random.random) where rownum < 4 表示从STAFF表中随机取3条记录 2.产生随机数 SELECT DBMS_RANDOM.RANDOM FROM DUAL; 产生一个任意大小的随机数 SELECT ABS(MOD(DB…
http://www.cnblogs.com/lgzslf/archive/2008/11/29/1343685.html select substr(dbms_random.random,2,2) random from (select * from dual order by dbms_random.random) Oracle 取随机数 1.从表中随机取记录 select * from (select * from staff order by dbms_random.random) …
1.从表中随机取记录 select * from (select * from staff order by dbms_random.random) where rownum < 4 表示从STAFF表中随机取3条记录 2.产生随机数 SELECT DBMS_RANDOM.RANDOM FROM DUAL; 产生一个任意大小的随机数 SELECT ABS(MOD(DBMS_RANDOM.RANDOM,100)) FROM DUAL; 产生一个100以内的随机数 SELECT TRUNC(100+…
1.从表中随机取记录SELECT * FROM (SELECT * FROM STUDENT ORDER BY DBMS_RANDOM.RANDOM) WHERE ROWNUM < 4--表示从STUDENT表中随机取3条记录 2.产生随机数SELECT DBMS_RANDOM.RANDOM FROM DUAL; --产生一个任意大小的随机数SELECT ABS(MOD(DBMS_RANDOM.RANDOM,100)) FROM DUAL; --产生一个100以内的随机数SELECT TRUNC…