如何在 MySQL 中创建一个四位随机数?
我们首先创建一个表 -
mysql> create table DemoTable717 ( UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, UserPassword int ); Query OK, 0 rows affected (0.81 sec)
使用插入命令在表中插入一些记录 -
mysql> insert into DemoTable717(UserPassword) values(1454343); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable717(UserPassword) values(674654); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable717(UserPassword) values(989883); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable717(UserPassword) values(909983); Query OK, 1 row affected (0.15 sec)
使用 select 语句显示表中的所有记录 -
mysql> select *from DemoTable717;
这将产生以下输出 -
+--------+--------------+ | UserId | UserPassword | +--------+--------------+ | 1 | 1454343 | | 2 | 674654 | | 3 | 989883 | | 4 | 909983 | +--------+--------------+ 4 rows in set (0.00 sec)
以下是查询,随机创建 4 位数并将其设置为 “UserPassword” 列 -
mysql> update DemoTable717 SET UserPassword=(select floor(0+ RAND() * 10000)); Query OK, 4 rows affected (0.22 sec) Rows matched: 4 Changed: 4 Warnings: 0
让我们再次检查表记录 -
mysql> select *from DemoTable717;
这将产生以下输出 -
+--------+--------------+ | UserId | UserPassword | +--------+--------------+ | 1 | 4319 | | 2 | 3902 | | 3 | 6553 | | 4 | 1060 | +--------+--------------+ 4 rows in set (0.00 sec)
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