Oracle、MYSQL隨機取數據

1.從 MySQL 隨機選取數據最簡單的辦法就是使用 ”ORDER BY RAND() ”;

SELECT * FROM 表名 ORDER BY  RAND() LIMIT 幾條數據;

2.Oracle 隨機取數據

SELECT * FROM (SELECT *FORM 表名 ORDEY BY DBMS_RANDOM.value) WHERE ROWNUM<條數+1
//DBMS_RANDOM.value爲隨機值

3.Oracle取最新的幾條

SELECT *  FROM (SELECT *  FROM 表名 ORDER BY DATE DESC)  WHERE ROWNUM <= 條數+1