MySQL生成随机数据

时间:2013-08-21 19:05:23

标签: mysql

在MySQL中我有一些表格,我需要将电话号码和电子邮件地址随机化,以便随机生成以用于开发目的。

在MySQL中,如何为电话号码生成7位唯一随机数?

如何生成545165498@mailinator.com之类的随机电子邮件地址。

如何使用MySQL查询生成此随机数据?

4 个答案:

答案 0 :(得分:6)

MySQL rand()返回0< = value<范围内的随机浮点值。 1.0

用另一个数字乘以UPPER_BOUND并得到它的最低点,你会得到一个介于0和(UPPER_BOUND-1)之间的随机整数,如下所示:

SELECT floor(rand() * 10) as randNum;

这只会给你一个0到10之间的随机数。

将10更改为比您想要生成的数字更高的数字。

这样的事情:

UPDATE user 
SET email = CONCAT(FLOOR(rand() * 10000000),'@mailinator.com'), 
    PhoneNo = FLOOR(rand() * 10000000)

答案 1 :(得分:5)

这应该给你一个7位数字的随机数

  

SELECT FLOOR(1000000 + RAND()* 8999999)

此类内容应根据您的要求更新您的电话号码和电子邮件地址

UPDATE Customers 
SET phone = CAST(FLOOR(1000000 + RAND(8999999) AS VARCHAR), 
email = CONCAT(CAST(FLOOR(1000000 + RAND(8999999) AS VARCHAR), '@mailinator.com')

答案 2 :(得分:4)

MySQL生成随机数据演练:

0(含)与1独占之间的随机数:

mysql> select rand();
+--------------------+
| rand()             |
+--------------------+
| 0.5485130739850114 |
+--------------------+                                                     
1 row in set (0.00 sec)

0(包括)和10独占之间的随机int:

mysql> select floor(rand()*10);
+------------------+
| floor(rand()*10) |
+------------------+
|                6 |
+------------------+
1 row in set (0.00 sec)

随机字母或数字:

mysql> select concat(substring('ABCDEF012345', rand()*36+1, 1));
+---------------------------------------------------------------------------+
| concat(substring('ABCDEF012345', rand()*36+1, 1))                         |
+---------------------------------------------------------------------------+
| F                                                                         |
+---------------------------------------------------------------------------+
1 row in set (0.00 sec)

随机字母a到z:

mysql> select char(round(rand()*25)+97);
+---------------------------+
| char(round(rand()*25)+97) |
+---------------------------+
| s                         |
+---------------------------+
1 row in set (0.00 sec)

随机8个字符的字母数字字符串:

mysql> SELECT LEFT(UUID(), 8);
+-----------------+
| LEFT(UUID(), 8) |
+-----------------+
| c26117af        |
+-----------------+
1 row in set (0.00 sec)

MySQL中的随机大写字母:

mysql> select CHAR( FLOOR(65 + (RAND() * 25)));
+----------------------------------+
| CHAR( FLOOR(65 + (RAND() * 25))) |
+----------------------------------+
| B                                |
+----------------------------------+
1 row in set (0.00 sec)

将随机行加载到表中:

mysql> create table penguin (id INT primary key auto_increment, msg TEXT);
Query OK, 0 rows affected (0.02 sec)

mysql> insert into penguin values (0, LEFT(UUID(), 8));
Query OK, 1 row affected (0.00 sec)

mysql> select * from penguin;
+------+----------+
| id   | msg      |
+------+----------+
|    0 | abab341b |
+------+----------+
1 row in set (0.00 sec)

加载随机行:

制作一个名为dennis的程序,将1000个随机行加载到企鹅中。

mysql> delimiter ;;
mysql> drop procedure if exists dennis;;
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> create procedure dennis()
    -> begin
    -> DECLARE int_val INT DEFAULT 0;
    -> myloop : LOOP
    ->   if (int_val = 1000) THEN
    ->     LEAVE myloop;
    ->   end if;
    ->   insert into penguin values (0, LEFT(UUID(), 8));
    ->   set int_val = int_val +1;
    -> end loop;
    -> end;;
Query OK, 0 rows affected (0.00 sec)  

mysql> call dennis();;

mysql> select * from penguin;;
+------+----------+                      
| id   | msg      |              
+------+----------+                   
|    0 | abab341b |                 
|    1 | c5dc08ee |           
|    2 | c5dca476 |
...
+------+----------+

更新表格中的所有行以获得随机数据:

mysql> create table foo (id INT primary key auto_increment, msg TEXT);
Query OK, 0 rows affected (0.02 sec)

mysql> insert into foo values (0,'hi');
Query OK, 1 row affected (0.00 sec)

mysql> insert into foo values (0,'hi2');
Query OK, 1 row affected (0.00 sec)

mysql> insert into foo values (0,'hi3');
Query OK, 1 row affected (0.00 sec)

mysql> select * from foo;
+----+------+
| id | msg  |
+----+------+
|  1 | hi   |
|  2 | hi2  |
|  3 | hi3  |
+----+------+
3 rows in set (0.00 sec)

mysql> update foo set msg = rand();
Query OK, 3 rows affected (0.00 sec)
Rows matched: 3  Changed: 3  Warnings: 0

mysql> select * from foo;
+----+---------------------+
| id | msg                 |
+----+---------------------+
|  1 | 0.42576668451145916 |
|  2 | 0.6385560879842901  |
|  3 | 0.9154804171207178  |
+----+---------------------+
3 rows in set (0.00 sec)

答案 3 :(得分:1)

这是一个生成具有许多选项的随机数据的在线工具。 http://www.generatedata.com/

只需输入参数即可定义所需的随机数据类型,并将其导出为适当的格式,然后即可加载。

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