如何在MySQL中使用随机数更新列中的记录？

首先让我们创建一个表 –

mysql> create table DemoTable746 (
   Number int
);
Query OK, 0 rows affected (0.56 sec)

使用插入命令将一些记录插入表中 –

mysql> insert into DemoTable746 values(100);
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable746 values(200);
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable746 values(300);
Query OK, 1 row affected (0.31 sec)
mysql> insert into DemoTable746 values(400);
Query OK, 1 row affected (0.20 sec)

使用 select 语句显示表中的所有记录-

mysql> select *from DemoTable746;

输出如下所示 –

+--------+
| Number |
+--------+
| 100    |
| 200    |
| 300    |
| 400    |
+--------+
4 rows in set (0.00 sec)

以下是用随机数更新记录的查询：

mysql> update DemoTable746 set Number=CAST(RAND() * 10000 AS UNSIGNED);
Query OK, 4 rows affected (0.13 sec)
Rows matched: 4 Changed: 4 Warnings: 0

让我们再次检查表记录 –

mysql> select *from DemoTable746;

输出如下所示 –

+--------+
| Number |
+--------+
| 4422   |
| 1350   |
| 3485   |
| 3371   |
+--------+
4 rows in set (0.00 sec)

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