SQL語句從數(shù)據(jù)庫表中隨機(jī)獲取10條數(shù)據(jù)：
    SQL Server:
    SELECT TOP 10 * FROM T_USER ORDER BY NEWID()
    ORACLE:
    SELECT * FROM (SELECT * FROM T_USER ORDER BY DBMS_RANDOM.RANDOM()) WHERE RONUM <= 10
    MySQL:
    SELECT * FROM T_USER ORDER BY RAND() LIMIT 10
    Access:
    SELECT TOP 10 * FROM T_USER ORDER BY rnd([一個自動編號字段])
    這條語句在 Access 中的“查詢”中是可以運行并得到隨機(jī)結(jié)果的，但在 ASP.NET等后臺程序代碼中卻無法得到預(yù)期的隨機(jī)效果。
    正確的寫法如下：
    以ASP.NET為例：
    Random random = new Random(System.Guid.NewGuid().GetHashCode());
    int r = random.Next();
    string sql = "SELECT TOP 10 * FROM T_USER ORDER BY RND(" + (-r) + "*自動編號字段)"