如何在MySQL中创建一个随机的四位数数字？
让我们首先创建一个表-
create table DemoTable717 ( UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, UserPassword int );
使用插入命令在表中插入一些记录-
insert into DemoTable717(UserPassword) values(1454343); insert into DemoTable717(UserPassword) values(674654); insert into DemoTable717(UserPassword) values(989883); insert into DemoTable717(UserPassword) values(909983);
使用select语句显示表中的所有记录-
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)
以下是创建随机4位数字并为“UserPassword”列设置的查询-
update DemoTable717 SET UserPassword=(select floor(0+ RAND() * 10000)); Rows matched: 4 Changed: 4 Warnings: 0
让我们再次检查表记录-
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)