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如何在MySQL存储过程中生成5个随机数？

2024-04-21 14:20:05 346

要生成随机数，请使用RAND()MySQL中的ORDERBY函数。让我们首先创建一个表-

mysql> create table DemoTable (Value int);

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable values(89);
mysql> insert into DemoTable values(98);
mysql> insert into DemoTable values(10);
mysql> insert into DemoTable values(78);
mysql> insert into DemoTable values(75);
mysql> insert into DemoTable values(76);
mysql> insert into DemoTable values(74);
mysql> insert into DemoTable values(99);
mysql> insert into DemoTable values(101);

使用select语句显示表中的所有记录-

mysql> select *from DemoTable;

这将产生以下输出-

+-------+
| Value |
+-------+
| 89    |
| 98    |
| 10    |
| 78    |
| 75    |
| 76    |
| 74    |
| 99    |
| 101   |
+-------+
9 rows in set (0.00 sec)

以下是在MySQL存储过程中生成5个随机数的查询-

mysql> DELIMITER //
mysql> CREATE PROCEDURE generate_Random5Numbers()
   BEGIN
      SELECT GROUP_CONCAT(Value SEPARATOR '/')
      FROM ( SELECT Value
         FROM ( SELECT Value
            FROM DemoTable
            WHERE Value BETWEEN 10 AND 100
         ORDER BY RAND()         LIMIT 5) Ascending_Order
      ORDER BY Value) 5Values;
   END
   //
mysql> DELIMITER ;

借助call命令调用存储过程。

mysql> call generate_Random5Numbers();

这将产生以下输出-

+-----------------------------------+
| GROUP_CONCAT(Value SEPARATOR '/') |
+-----------------------------------+
| 89/74/78/99/10                   |
+-----------------------------------+
1 row in set (0.00 sec)

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如何在MySQL存储过程中生成5个随机数？

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