從mysql數(shù)據(jù)表中隨機取出一條記錄？order by rand() 就是隨機排序order by rand() limit 1 就是隨機獲取一行數(shù)據(jù).滿足2個條件，第一是 `Sex`="男" 和

從mysql數(shù)據(jù)表中隨機取出一條記錄？

order by rand() 就是隨機排序order by rand() limit 1 就是隨機獲取一行數(shù)據(jù).滿足2個條件，第一是 `Sex`="男" 和`Ctiy`="廣州"select * from `user` where`Sex`="男" AND `Ctiy`="廣州" order by rand() limit 1

MySQL實現(xiàn)隨機獲取幾條數(shù)據(jù)的方法？

1：你要隨機更新的話。要先查幾條隨機數(shù)據(jù)。然后根據(jù)查詢的數(shù)據(jù)一個特定字段去更新。但是又不能在查詢的時候同時更新。會報錯。要先將查詢出來的存儲到臨時表。再進行修改。

下面是我的s_grader 表結構和我的SQL語句。就實現(xiàn)了隨機查詢兩條。然后進行修改。要隨機修改幾條就把Limit后面的2改成幾。親測可行。

UPDATE s_grader SET Sgrad="999" WHERE Sname in ( SELECT F.Sname FROM (SELECT * FROM s_grader ORDER BY RAND() LIMIT 2) F)

mysql隨機查詢?nèi)舾蓷l數(shù)據(jù)的方法？

1.隨機讀取連續(xù)多條記錄。經(jīng)過實踐，可以隨機讀取多條連續(xù)的數(shù)據(jù)記錄，里頭取值的一般都是主鍵ID來進行最大值、最小值的讀?。?/p>

SELECT * FROM example_table AS t1 JOIN (SELECT ROUND(RAND() * ((SELECT MAX(id) FROM example_table)-(SELECT MIN(id) FROM example_table)) (SELECT MIN(id) FROM example_table)) AS id) AS t2 WHERE t1.id >= t2.id ORDER BY t1.id LIMIT 5

2.隨機多條數(shù)據(jù)。以下兩種都是隨機讀取數(shù)據(jù)，查詢數(shù)據(jù)速度、隨機范圍都基本相差不大

SELECT * FROM example_table WHERE id >= ((SELECT MAX(id) FROM example_table)-(SELECT MIN(id) FROM example_table)) * RAND() (SELECT MIN(id) FROM example_table) LIMIT 5

SELECT * FROM example_table WHERE id>=(SELECT floor(RAND() * ((SELECT MAX(id) FROM example_table)-(SELECT MIN(id) FROM example_table)) (SELECT MIN(id) FROM example_table))) ORDER BY id LIMIT 5

如何從數(shù)據(jù)庫隨機取出數(shù)據(jù)？

從mysql數(shù)據(jù)庫表中隨機獲取數(shù)據(jù) 其實，從數(shù)據(jù)庫隨機獲取數(shù)據(jù)，很簡單，只須用到一個rand()函數(shù) select * from table_name order by rand() limit 0，5下面是一個小實例：從文章表中隨機獲取5條數(shù)據(jù)。$dblink=mysql_connect("localhost"，"root"，"123456")mysql_query("set names utf8")mysql_select_db("aixuexi") $sql="select * from waxx_article order by rand() limit 0，5" $rs=mysql_query($sql) while($row=mysql_fetch_array($rs)){ $rows[]=$row } if($rows){ foreach($rows as $v){?>