【转】oracle 中随机取一条记录的两种方法

oracle 中随机取一条记录的两种方法

V_COUNT INT:=0;

V_NUM INT :=0;

1:TBL_MYTABLE 表中要有一个值连续且唯一的列FID

BEGIN

SELECT COUNT(*)

INTO V_COUNT

FROM  TBL_MYTABLE;

SELECT TRUNC(DBMS_RADOM.VALUE(1,V_COUNT+1)) INTO V_NUM FROM DUAL;

SELECT *

FROM TBL_MYTABLE T

WHERE T.FID=V_NUM;

EXCEPTION

WHEN NO_DATA_FOUND THEN

NULL;

END;

2:第二种方法很简便

BEGIN

SELECT *

FROM

(

SELECT *

FROM TBL_MYTABLE T

ORDER BY DBMS_RADOM.VALUE();

)

WHERE ROWNUM<2;

EXCEPTION

WHEN NO_DATA_FOUND THEN

NULL;

END;

参考：http://www.cnblogs.com/yjl49/archive/2009/12/11/2371977.html