oracle 中隨機取一條記錄的兩種方法
V_COUNT INT:=0;
V_NUM INT :=0;
1:TBL_MYTABLE 表中要有一個值連續且唯一的列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:第二種方法很簡便
BEGIN
SELECT *
FROM
(
SELECT *
FROM TBL_MYTABLE T
ORDER BY DBMS_RADOM.VALUE();
)
WHERE ROWNUM<2;
EXCEPTION
WHEN NO_DATA_FOUND THEN
NULL;
END;
參考：http://www.cnblogs.com/yjl49/archive/2009/12/11/2371977.html